Prostamax: The Definitive Guide

What is Prostamax?

Prostamax is a lab-made peptide, a short chain of four amino acids, that people inject hoping to help an enlarged prostate, chronic prostatitis or urinary symptoms such as a weak stream and waking at night to urinate.

It comes from a Russian research program led by Vladimir Khavinson, whose group calls these short peptides bioregulators and names each one after the organ it is meant to target. The group's 2001 patent describes the chain lysine, glutamic acid, aspartic acid and proline, written Lys-Glu-Asp-Pro or KEDP, with the formula C20H33N5O9 and a molecular weight of about 487.5. The patent presents it as a lab-made successor to Prostatilen, an older preparation extracted from animal prostate tissue. [1], [2], [3] The molecule studied in the published papers is the “free acid” form, H-Lys-Glu-Asp-Pro-OH, with no chemical cap on its end. [4]

The Russian company Geropharm and the Tomsk Institute of Pharmacology presented Prostamax in 2009 as a new peptide drug “in joint development”, and Geropharm's 2015 pipeline still listed it under urology. We found no registration, trial permit or later news. [5], [6] Today it is sold mostly as 20 mg vials of freeze-dried powder labeled for research, and the developer institute's own catalogue of lab-made peptide capsules does not include it. [7], [8] FDA told one US seller in June 2026 that its Prostamax is an unapproved new drug. [9]

The name covers several unrelated products. A registered medicine in Uzbekistan sold as Prostamax is a rectal suppository made from prostate extract. A Ukrainian capsule sold as Prostamax is a saw palmetto supplement. Libidon, often sold beside it, is a capsule of natural prostate peptides. None of them is the four-amino-acid peptide this guide covers. [10], [11], [12]

Doserly

One name, several products

Prostamax (KEDP) research vials and pens

What it is: Lab-made Lys-Glu-Asp-Pro, 20 mg vials of powder or prefilled pensRoute: Injection: subcutaneous in practice; into a muscle in the patentWebsite schedule: Most often 500 mcg–1 mg once dailyHuman data: Patent case series only

Italian blend (RESIFLEXIN Plus)

What it is: Capsules listing KEDP, KEDG and KE (Vilon) with arginine and plant extractsKEDP amount: Not statedHuman data: None

Not Prostamax (KEDP)

“Prostamax” suppositories (Uzbekistan): Registered medicine: 50 mg prostate extract, rectal“Prostamax” capsules (Ukraine): Saw palmetto supplementLibidon: Natural prostate peptide complex (A-16), 10 mg per capsuleProstatilen: Preparation extracted from animal prostate tissue; the patent’s ‘prototype’

Amounts are as stated by each product; no public test shows what any research vial contains.

Only the lab-made KEDP peptide is Prostamax in this guide; the other products are different substances with their own evidence.

Typical Prostamax Protocols

The most common pattern in the reviewed sources is 500 mcg to 1 mg once a day by injection. Sources split on how long to keep going: some describe a 10–20-day course repeated a few times a year, and a copied template describes a continuous 8–12-week run that steps up from 500 mcg (see the intramuscular table below). [14], [18], [7], [19], [20]

Titration Changing the amount in steps

Short-course pages use one fixed amount. The copied 8–12-week template starts at 500 mcg a day for two weeks, moves to 750 mcg for two weeks and then 1 mg. Another page starts at 500 mcg and raises it to 1 mg “based on tolerance”, and one goes on stepping up to 3 mg a day by week 7. No study has tested any of these steps. [19], [18], [21]

Breaks and cycles

Short courses are followed by a break: 3–6 months in two sources and 4–6 months in the pen protocol, so about 2–4 courses a year. The 8–12-week template does not describe a break. [13], [18], [15], [7]

Timing

Most pages give no time of day; one says any consistent time. Community education groups mention morning injections. [7]

Read the units: mcg means micrograms, and 1 mg equals 1,000 mcg. A 20 mg vial holds 20,000 mcg, so the vial size is a stock, not a dose. Each amount here is for one injection, and each schedule gives one injection a day, so the amount and the daily total are the same number. How mcg converts to syringe units.

Before you compare any of these numbers, four cautions. First, urinary symptoms and a raised PSA (prostate-specific antigen, a blood test used to check the prostate) can come from an enlarged prostate, infection or prostate cancer, so they need a medical check first; Prostamax has never been tested on PSA or cancer (see the risks). [22], [23] Second, do not stop or change prescribed prostate medicines on your own. Third, the men in the developers' patent examples received it into a muscle in amounts that were never reported one by one, and no side-effect collection was described, so the injected amounts in these tables are untested. [1] Fourth, a rat abstract suggests it can lower male-hormone activity, the opposite of what some “sexual function” marketing implies. [24]

Each row is a complete schedule from one source, so its amount and duration belong together. Low, mid and high are alternatives, not steps to move through. These schedules come from protocol websites and a seller's pen instructions rather than clinical trials; the cited references give the full details.

What about intramuscular injection, the route used in the patent?

The patent range is so wide (a 10,000-fold spread) that almost every website amount fits inside it. That makes it a boundary, not a guide: it does not say which amount any patient received or which amount worked. [1]

In community education groups, three traditions show up. The most common is roughly 500–750 mcg a day by subcutaneous injection for 30–60 days, repeated a few times a year. A second applies a general rule used for every bioregulator, 1–2 mg a day for 20–30 days, which one educator said was worked out from capsule products rather than injection studies. A third uses a short 10-day course once or twice a year. None of the educators cited a Prostamax dosing study, and their daily amounts differ about tenfold.

Where protocols differ: products, routes, units and course length ↓

What is Prostamax commonly used for?

People usually look into Prostamax because of prostate symptoms: a weak or stop-start stream, dribbling, needing to go often, waking at night to urinate, or pelvic pain that has been called chronic prostatitis. In community education groups, most are men in their late 50s to 70s, and some want to protect the prostate as they age. A smaller group hopes it will lower a raised PSA.

The developers' patent describes the peptide as “regulating prostate functions” and tested it in chronic prostatitis and prostate adenoma, the older term for benign enlargement. FDA's 2026 warning letter quotes a seller's claims that it reduces prostate inflammation and helps BPH and bladder control. The sections below describe what was measured; they do not show that Prostamax treats or prevents any of these conditions. [2], [9]

An enlarged prostate (BPH) and urinary symptoms

Benign prostatic hyperplasia (BPH) is growth of the prostate that is not caused by cancer. It can make it hard to start or empty, weaken the stream and cause frequent, urgent or night-time urination, and it sometimes leads to urinary retention, where the bladder cannot empty. [22] The patent reports that 19 men with early-stage adenoma urinated faster and less often during the day after 10–40 days of injections, and a second company's patent reports that 16 men felt better on suppositories. Neither reported results for its comparison group or was published in a journal. See what those reports can and cannot show. [2], [34]

Approved medicines for BPH already exist, including alpha blockers, 5-alpha reductase inhibitors and the phosphodiesterase-5 inhibitor tadalafil. [22], [35]

Chronic prostatitis and pelvic pain

Prostatitis covers several conditions: chronic prostatitis or chronic pelvic pain syndrome, acute and chronic bacterial infection, and inflammation found by chance without symptoms. [36] The patent's larger example was 35 men aged 23–45 with chronic prostatitis who had not done well on usual treatment; it reports that pain disappeared in 64% and urination improved after 10–40 days. In rats, the peptide reduced scarring in a surgical prostatitis model and lowered an inflammation score in infected rats. [2], [37], [1]

Shrinking the prostate

The idea that Prostamax shrinks the prostate rests on two sources. In one rat study, glands enlarged with a drug (sulpiride) were 24% lighter and 40% smaller in volume after 60 days of the peptide, but the printed dose is a thousand times higher than the same group used a year earlier. The patent's prostatitis example says ultrasound showed a smaller prostate, without numbers. No study measured prostate size in men with BPH in a way that can be checked. [38], [2]

Lowering PSA

No study has measured Prostamax and PSA. Neither patent reports PSA. [2], [34] PSA can rise with BPH, prostatitis or cancer, and a product that lowered it would not show which one is present. Why that matters.

Sexual function and libido

Prostamax is often filed under “hormonal and sexual health”. The patent reports that sexual function improved in men with chronic prostatitis and that about 37% of men in each example noted better libido, but these were questionnaire answers without a comparison. [2] A rat abstract from the drug's developers found the opposite direction for hormones: smaller seminal vesicles, which the authors called an anti-androgenic effect. [24] See the hormone question.

Other uses you may come across

Some pages describe Prostamax as an anti-aging peptide because it loosened packed DNA in white blood cells from very old people, in the laboratory. Others claim it reduces prostate cancer risk, or cite “more than 10,000 patient-years” of safe use. We found no data for either claim. [39], [32], [40]

See the human research or explore how it might work.

Where do Prostamax protocols differ?

The recurring 500 mcg–1 mg a day is easy to summarize. The disagreements start when a page mixes up products, routes or units. Here is what varies and why it matters.

Which Prostamax is the number for?

Check this first. The lab-made peptide is sold as 20 mg vials or prefilled pens. The Uzbek Prostamax is a 50 mg suppository of prostate extract, the Ukrainian Prostamax is saw palmetto, and Libidon capsules contain 10 mg of a natural prostate “peptide complex”. Their amounts cannot be compared with Prostamax amounts. [7], [15], [10], [11], [41] One page even prints the wrong sequence, Lys-Asp-Glu-Leu, and another shows an unrelated chain of amino acids. [32], [40]

Micrograms, milligrams and a thousandfold spread

Published daily amounts run from 100 mcg to 10 mg for injections and up to 40 mg a day for capsules that nobody could trace to a product. Even the research is inconsistent: the suppository patent gives 0.3–1.0 mg per suppository in its claim and 0.3–1.0 mcg in its patient example, and a 2014 rat study prints a dose a thousand times higher than the same group's 2013 study. [13], [30], [28], [34], [38], [37] The figure below puts the human and website numbers on one scale.

Doserly

Daily amounts span more than 10,000-fold

From the developers' patents

Patent patient range (70 kg man)

0.7–7,000 mcg a day for a 70 kg man (patent range, into a muscle).

Suppository patent: example

0.3–1.0 mcg a day in the suppository patent example.

Suppository patent: claim

300–1,000 mcg a day in the suppository patent claim.

1,000-fold conflict in the same patent.

From websites and sellers

Website low (subcutaneous)

100–200 mcg a day (website low, subcutaneous).

Most common website pattern

500–1,000 mcg a day (most common website pattern).

Pen protocol

2,000 mcg (2 mg) a day (pen protocol).

Seller claim (10 days)

5,000–10,000 mcg (5–10 mg) a day (seller claim, 10 days).

Capsule claims (no traceable product)

10,000–40,000 mcg (10–40 mg) a day (capsule claims, no traceable product).

Animal doses are not shown and cannot be converted to human doses. Daily amounts; one injection a day unless stated.

Amounts cannot be compared across sources: they span more than 10,000-fold, and one patent contradicts itself 1,000-fold.

Is the number for one dose or the whole day?

5 mg twice a day is 10 mg for the day. Most pages give one daily injection, so the dose and the daily total match. Twice-daily use appears only in forum posts, including one person who reported 5 mg twice a day for 20 days. [42] Pens count in clicks: at 100 mcg a click, 20 clicks is 2 mg. [15]

Into a muscle or under the fat?

The inventors injected their patients into a muscle, and several websites say intramuscular only. Most forum users and community education groups use subcutaneous injection (into the fatty layer under the skin). Forum users argue about which works better, with no data either way. [2], [19], [43] How routes compare.

How many days, and how often is a course repeated?

Courses range from 10 days (pen protocol, several websites and one community education tradition) through 10–40 days (patent), 30–60 days (a community education tradition) to 8–12 weeks (the copied stepped template), and one member of a community education group reported about three months without a break. Repeats range from every 3–6 months to “2–3 courses a year”. [15], [1], [19], [18] These are conventions, not results from a trial comparing course lengths; nothing shows that a longer course works better.

Do sources start low and step up?

Some do. The copied template climbs from 500 to 1,000 mcg over four weeks, one page climbs to 3,000 mcg by week 7, and one page raises the amount by tolerance. Short-course pages and the pen protocol use one fixed amount. The only person-level titration we found in community education groups started at 500 mcg for three days, moved to 800 mcg a day and then to 1 mg every other day. [19], [21], [18], [15]

Are there capsules?

Many pages give capsule doses of 10–40 mg a day, and some say a Russian capsule holds about 20 mg of peptide. We could not find any such capsule: the developer institute's catalogue does not list Prostamax, and the prostate capsule it does sell, Libidon, is a natural extract. An Italian blend lists KEDP with two other peptides but does not state the amount. [28], [29], [44], [45], [8], [12], [46]

How do micrograms convert to syringe units?

Injection pages often give amounts as “units” on an insulin syringe. A U-100 syringe holds 100 units per millilitre, so units measure volume, not an amount of Prostamax. How much peptide each unit holds depends on how much water was added to the vial.

For example, a 20 mg vial mixed with 2 mL of water holds 10 mg per mL, so each unit holds 100 mcg: 500 mcg is 5 units, 750 mcg is 7.5 units and 1 mg is 10 units. This is the example the stepped template uses. The same 750 mcg from a 20 mg vial mixed with 3 mL is about 11 units. Doserly's reconstitution calculator works this out for any vial and shows each step. [7], [21]

What happens when you stop Prostamax?

No study has followed people after stopping. The patent says the effect was “prolonged” without giving a follow-up time, and no report describes withdrawal effects or a rebound. [2]

Public forum accounts point both ways, and each is one person:

• One user said the benefit of a 3-week course lasted about six months; he then started a prostate supplement. [16]
• Another, who also took tadalafil, said morning trickling came back soon after his 3-week course and he reordered. [16]
• In another thread, a user said his BPH symptoms returned when he ran out for several weeks. [43]
• A user whose PSA rose while taking it reported only a small fall, from about 15 to about 13, about six weeks after stopping, and said he would have it checked. [43]

The end of a course is a sensible time to review symptoms and any PSA results with a clinician, especially if any prescribed medicine was changed along the way.

Do injected and other forms of Prostamax behave the same way?

No one has measured this for any route. A subcutaneous injection is absorbed from the fatty layer under the skin; an intramuscular injection is absorbed from muscle, which usually has a richer blood supply. Those are different starting points, so the same amount by each route would not necessarily give the same exposure. For Prostamax, nobody has measured either one.

Bioavailability is how much of a dose reaches the blood in the form being measured. For Prostamax it is unknown for every route. Computer models from the developer's group predicted that the peptide could fit some transporter proteins in the gut and elsewhere, while another of their papers noted that it did not bind strongly to the transporter most common in prostate tissue. Predictions are not measurements of absorption. [50], [51]

How long does Prostamax last in the body?

Nobody knows. No study has measured its half-life, its blood levels or how quickly it is broken down, in people or animals. Pharmacokinetics, the study of how the body absorbs and clears a substance, has simply not been done for Prostamax.

What about suppositories, capsules and nasal sprays?

• Suppositories. A second Russian company patented a rectal suppository of the peptide in 2017 and reports 16 men with BPH; its unit conflict is described above. It is a patent, not a product we could find on sale. [34]
• Capsules. No capsule stating its Prostamax content could be verified, and an Italian blend does not state the amount. [8], [46]
• Nasal sprays and pens. One South African seller lists pens and nasal sprays; no data exist for either. [52]

Should it be injected near the prostate?

No source describes injecting near or into the prostate, and the patients in the patent received injections into a muscle elsewhere in the body. The idea that each bioregulator acts on its own organ comes from pieces of rat tissue grown in a dish, and in those experiments Prostamax also acted on brain and skin tissue. [2], [53], [54]

Free acid or amide: is every vial the same molecule?

The papers describe the free acid, H-Lys-Glu-Asp-Pro-OH, and the patent's synthesis example made its acetate salt. [4], [2] Research vials rarely state the form, and no public test shows what any vial contains or how much.

How should Prostamax be stored, and how long does it last?

There is no stability study for any Prostamax product. What exists are seller and website instructions:

• Powder, before mixing. Several pages say to keep the freeze-dried (lyophilized) powder frozen at −20 °C (−4 °F) for long-term storage, or refrigerated for short periods. [25], [21]
• After mixing. Once the powder is mixed with liquid (reconstituted), pages say to refrigerate it at 2–8 °C (36–46 °F), but their “use within” times range from 14 days to 30 days, and some simply say to follow the product's instructions. None cites a stability test. [14], [25], [47], [18], [7]
• Pens. The Ukrainian pen seller says to keep pens at 2–8 °C. [15]
• Suppositories. The 2017 patent says its suppositories are “stable on storage” but gives no shelf life for the public. [34]

Health Canada warns that unauthorized injectable peptides may not have been made or stored safely, and cold storage cannot tell you what is in a vial (see product quality). [55]

What do we actually know about Prostamax in people?

Very little. The only human data are three small patient series described in two patents: two from the developers in 2001 and one from a second company in 2017. None was published in a journal or described as randomized (assigned by chance) or blinded (hiding who got what), and none described how side effects were collected. ClinicalTrials.gov has no Prostamax study. [1], [34], [56]

Some evidence-review websites, and an earlier version of this guide, said there were no human data. The patent examples do exist and can be read; they are simply weak evidence. [49], [13]

What did the patent examples report?

Doserly

The only human data: three patent case series

Chronic prostatitis · 2001 patent

People: 35 men aged 23–45 treated; 14 on usual treatmentRoute: Into a muscle, 0.01–100 mcg/kg once daily, 10–40 daysPublished in a journal: ○ NoRandomized: − Not describedBlinded: − Not describedControl group results reported: ○ NoIndividual doses reported: ○ NoSide effects collected: − Not describedPSA measured: ○ No

Prostate adenoma (BPH) · 2001 patent

People: 19 men aged 51–67 treated; 17 on usual treatmentRoute: Into a muscle, same range, 10–40 daysPublished in a journal: ○ NoRandomized: − Not describedBlinded: − Not describedControl group results reported: ○ NoIndividual doses reported: ○ NoSide effects collected: − Not describedPSA measured: ○ No

BPH suppositories · 2017 patent

People: 16 men aged 50–63 treated; 5 on other medicinesRoute: Rectal, once daily, 10–40 days; dose printed as 0.3–1.0 mg and 0.3–1.0 mcgPublished in a journal: ○ NoRandomized: − Not describedBlinded: − Not describedControl group results reported: ○ NoDose clearly stated: ○ No (1,000-fold conflict)Side effects collected: − Not describedPSA measured: ○ No

Registered clinical trials of Prostamax: 0 (ClinicalTrials.gov, searched 24 Sep 2026)

70 treated men, all in patents: none published in a journal, none described as randomized or blinded, and no trial registered.

Why are these reports so hard to judge?

Patents are written to claim an invention, not to test it. In the 2001 examples, the men were already taking or had taken other treatments, the patent describes results only “before” and “after” in the treated men, and the 14 and 17 control patients appear only as a sentence. Symptoms like these vary over time, so a before-and-after change without a comparison group says little. [2]

The numbers also do not quite add up. For example, 64.0% of 35 men would be 22.4 men, and 37.3% of 19 would be 7.1. That suggests the percentages were worked out on different groups than described. None of this means the reports are false; it means they cannot be checked. [2]

Were there other studies in people?

Not with Prostamax given to people. Several papers used white blood cells from very old volunteers, but the cells were treated in the laboratory; the volunteers never received the peptide. [39], [57] A 2010 dissertation on prostate disease in older men tested Prostamax only on rat tissue in a dish. [58] The older clinical papers on prostate peptides describe Prostatilen, an animal extract, and cannot be counted for the lab-made peptide. [59], [60]

A 2012 paper often cited as Prostamax evidence in human prostate cells actually tested a different peptide, Vesugen (Lys-Glu-Asp). [61]

What do the urinary measures mean?

• Urine flow rate (uroflowmetry) measures how fast urine comes out, in mL per second. Weaker flow is typical of BPH, but a single test varies with how full the bladder is.
• Daytime and night-time urination are counts from the patient's own diary or recall.
• The IPSS (International Prostate Symptom Score) is a standard seven-question score doctors use for BPH symptoms. None of the Prostamax reports used it.
• Prostate size is measured by ultrasound. Only the suppository patent gives a number, for 4 men. [34]

What the reports did not measure is what matters most over years: symptom scores, PSA, urinary retention, the need for surgery and side effects.

How might Prostamax work?

The developers' idea is that short peptides act as tissue-specific signals that switch genes on or off in their target organ. For Prostamax, that means prostate cells. The experiments below test pieces of that idea. They are preclinical (in rats, tissue pieces, cells and test tubes), and nearly all come from the developer's network and its commercial partner.

Does it act only on the prostate?

Not in the developers' own experiments. At 0.05 ng per mL, Prostamax increased the growth of small pieces of rat prostate kept alive in a dish (explants) by about 25%, and fewer prostate cells stained for p53, a protein that can halt damaged cells. [62], [53] But in the same program it reduced the growth of pieces of deep brain tissue by 28% in young rats and 23% in old rats, and it stimulated skin tissue. [63], [53], [54] In the patent, it also increased the growth of bladder tissue from chick embryos by 23%. [2] So its effects in a dish are not limited to the prostate, and what a slower-growing brain explant means in a living body is unknown.

What happened in rats with prostatitis?

• Infection model (patent). Rats with prostatitis caused by E. coli bacteria received 0.1 mcg by subcutaneous injection daily for 10 days. The average inflammation score was 1.81 on Prostamax, 2.36 with salt water and 2.91 without treatment, but 7 of 11 rats still had prostatitis in both the Prostamax and salt-water groups. [2]
• Surgical model, 2013. In 60 rats with chronic prostatitis caused by surgery (without infection), 20 mcg per kg into a muscle for 15 days reduced scarring: the area of collagen fibers fell more than 2.5-fold and the gland's density returned to normal, similar to a prostate extract and a saw palmetto product. The operated glands had not grown larger in this model, so it could not test shrinkage. [37]

What happened in rats with an enlarged prostate?

In a 2014 study, 40 rats were given sulpiride, a drug that raises the hormone prolactin and more than doubled the size of the side lobes of their prostates. Adding the peptide into a muscle every day for 60 days made those lobes 24% lighter and 40% smaller in volume than in rats given sulpiride alone. The paper prints the dose as 20 mg per kg, a thousand times the 20 mcg per kg the same group used in 2013, and the discrepancy is unexplained. [38]

Does it affect male hormones?

Possibly, and in the opposite direction to the marketing. A 2011 conference abstract from the Tomsk team and Geropharm tested 20 and 40 mcg per kg in rats and mice. The seminal vesicles, glands that depend on male hormones, were 23.5–42.9% lighter relative to body weight, which the authors describe as an “anti-androgenic” effect (androgens are male hormones such as testosterone). The same abstract reports an 84% rise in urine output at 40 mcg per kg, less swelling in an inflammation test and 54–60% lower pain responses. [24]

This is one abstract without hormone blood tests, group sizes or a stated route, so it is a signal, not a finding. A 2010 dissertation also describes Prostamax as having anti-androgenic effects, without data. [58] It is not a steroid or a hormone itself.

Does it reduce inflammation?

In a blinded 2011 study in 90 rats funded by Geropharm, only the highest dose tested, 1,000 mcg per kg into the belly cavity, reduced paw swelling (by 23% at 2 hours and 19% at 4 hours). The standard anti-inflammatory drug diclofenac almost completely blocked it. [64]

What does it do to chromatin in white blood cells?

Chromatin is DNA wound around packaging proteins. In white blood cells from people aged 75–88, grown in the laboratory, Prostamax loosened tightly packed chromatin, which the developers treat as reversing an aging pattern. [39], [4] In a 2012 study in cells from people aged 75–86, it also doubled sister-chromatid exchanges from 5.9 to 12.0 per cell. [57] The authors read that as chromatin opening up. Toxicologists have long used a rise in these exchanges as a sign that a substance may damage DNA, so the finding needs a safety explanation that no study has provided. [65]

A 2009 paper sometimes cited for this effect reports results for copper and cadmium only in its abstract, not for Prostamax. [66]

Does it bind DNA?

That is the proposed mechanism, but it has been shown only in test tubes and computers. In a test tube, Prostamax and other short peptides changed the temperature at which DNA strands separate, and a computer model predicted a binding site on DNA. Neither shows the peptide reaching DNA inside a living prostate. [67], [68]

Explore every Prostamax experiment in the research library.

What are the risks and unanswered questions?

Is Prostamax safe?

Its safety in people has not been established. The chronic prostatitis example reports only that repeated blood counts and blood chemistry showed “no significant deviations”, with no description of how side effects were looked for, and the courses lasted 10–40 days. [2]

The patent's animal tests found no deaths or organ damage in mice given single doses of 1–5 mg per kg, in rats given up to 3 mg per kg daily for 90 days, or in rats given up to 1 mg per kg daily for six months, all into a muscle. No lethal dose was found. These were the inventors' own tests, reported briefly, and no long-term cancer study has been done. [1]

Could it hide prostate cancer or confuse a PSA test?

This is the most important practical risk. PSA is a protein made by normal and cancerous prostate cells. It can rise with prostate cancer, BPH or prostatitis, and temporarily after infection, a biopsy, vigorous cycling or ejaculation. [23] A raised PSA is a reason for medical assessment, not for a trial of a peptide.

No study has measured what Prostamax does to PSA, in either direction. [2], [56] Two things are known from other medicines: finasteride lowers PSA by about half, so doctors double the reading to interpret it, and a confirmed rise on finasteride still needs checking. [69] Any product that changed PSA without that kind of correction could make a reading harder to interpret.

In public forums and community education groups, people describe starting Prostamax to bring a raised PSA down, including one spouse who ordered it for her husband during an active urology workup. One public forum user's PSA rose while he took it and had fallen only to about 13 some six weeks after he stopped. [43] In one community education group, a member whose enlarged prostate turned out to be cancer urged others to get checked first.

Could it lower male-hormone activity?

Possibly. The only animal data on hormone-dependent organs found smaller seminal vesicles in rats, which the authors called anti-androgenic, and no study measured testosterone or other hormones. [24] Whether this happens in men, and whether it matters for sexual function, fertility or people on testosterone therapy, is unknown.

What problems have actually been reported?

Very few, and none formally. One public forum user reported “tremendous prostate pain” after using it, and another said he was “peeing all day” on his second day at about 1 mg a day. [43], [16] No one in the community education groups reviewed described side effects from Prostamax, but few reported any structured checks, so their silence says little about safety. No published case report of harm was found.

Could product quality change the risk?

Yes. Research vials are sold without the testing required for medicines, and in community education groups members reported that certificates of analysis were rare, that few labs test bioregulators and that one vial arrived without its vacuum seal. Pages disagree about the molecule, and at least two print the wrong sequence. [32], [40] Health Canada warns that unauthorized injectable peptides may cause infection or allergic reactions, may contain ingredients or contaminants not on the label and may not have been made or stored safely. [55]

When is it urgent?

Some urinary problems need prompt care whatever else you are taking. US health guidance says to tell a health professional right away if you cannot urinate at all; have painful, frequent and urgent urination with fever and chills; see blood in your urine; or have great discomfort or pain in your lower abdomen or urinary tract. [22]

Is Prostamax legal? Is it FDA-approved?

Checked September 24, 2026. Rules differ by country and change quickly. A “research use only” label does not make a product legal to sell or safe to use.

United States. Prostamax is not an FDA-approved medicine: a search of FDA's approved-drug database found no entry. [70] On June 17, 2026, FDA sent a warning letter to a US peptide seller stating that its “Prostamax” is an unapproved new drug under section 505(a) of the Federal Food, Drug, and Cosmetic Act, citing website claims about BPH and prostatitis. [9] It is not among the substances nominated for pharmacy compounding (list updated May 14, 2026), not on FDA's list of compounding substances that may pose significant safety risks, and not in the compounding regulation's list of allowed bulk substances. [71], [72], [73]

Canada. Health Canada's August 1, 2025 advisory names Prostamax among unauthorized injectable peptide drugs seized from a seller. It is the only Health Canada record for Prostamax, including archived records. Selling unauthorized drugs is illegal in Canada. [55], [74], [75]

Australia. Prostamax is not named in the June 2026 Poisons Standard, and the Therapeutic Goods Administration's (TGA's) 2026 warnings on unapproved peptides do not name it. A live search of the Australian Register of Therapeutic Goods could not be completed. The TGA says unapproved peptide products “have not been assessed by the TGA for safety, quality or effectiveness”, and personal importation is permitted only if products are clearly and accurately labelled; labelling is one condition, so a well-labelled vial is not automatically legal to import. [76], [77], [78]

United Kingdom. A search of UK government sites, which include the medicines regulator (MHRA), found no record for Prostamax. [79]

Russia and elsewhere. We found no Russian medicine registration or supplement certificate for the lab-made peptide, but the Russian registers could not be searched. The medicine registered as Prostamax in Uzbekistan is a prostate-extract suppository, not KEDP. [6], [10]

Is Prostamax banned in sport? Does it show up on a drug test?

Prostamax is not named on the World Anti-Doping Agency's 2026 list or on the 2027 list that takes effect on January 1, 2027. Category S0 bans at all times any substance “with no current approval by any governmental regulatory health authority for human therapeutic use”, and the 2027 list adds “peptides” to its examples. WADA has not ruled on Prostamax specifically, so tested athletes should assume S0 can apply. [80], [81] No published anti-doping test for Prostamax was found.

Who should be especially cautious?

These groups have no safety data. That is a reason for caution, not proof of harm.

• Anyone with a raised or rising PSA, blood in the urine, or a prostate being investigated. Assessment comes first (see above). [23], [22]
• Anyone taking prescribed prostate medicines such as alpha blockers, finasteride or dutasteride, or tadalafil. In community education groups, two members stopped their alpha blocker during a self-directed course. Changes belong with the prescriber. [22]
• Anyone awaiting prostate surgery or other planned treatment. In one community education group, a member described a friend using it while waiting for surgery; no study has looked at it before or after surgery.
• Men on testosterone therapy or trying to conceive, because of the rat anti-androgenic signal and the lack of hormone data. [24]
• Young men with pelvic pain. Chronic pelvic pain has several causes, and in community education groups it has been suggested even for men in their early 20s. Prostamax has not been studied in young men beyond the patent example. [36]
• Children and teenagers, and anyone who is pregnant or breastfeeding. Never studied; this guide is written for adults.
• Competitive athletes. See the anti-doping section above. [80]

Has Prostamax been tested alongside other medicines?

No. The men in the patent examples had previously used other treatments, which the patent does not list. Nothing is known about combining Prostamax with alpha blockers such as tamsulosin, 5-alpha reductase inhibitors such as finasteride, tadalafil, testosterone, GLP-1 weight-loss medicines or other peptides. [2]

In public forum and community education group reports, it was often combined with a bladder bioregulator, tadalafil, weight loss or testosterone, which makes it impossible to say which one helped. [82], [16] Bring a complete list of everything you take to a pharmacist or doctor.

What should be monitored while using Prostamax?

No regulator has written a monitoring plan for Prostamax, and the vials are sold for laboratory research with no approved label. What exists is a record of what the patent examples measured and general guidance on prostate symptoms. It can help you prepare questions for a clinician; it is not a personal testing plan. [2]

What did the patent examples check?

• Urination: flow rate on uroflowmetry, time to maximum flow, daytime and night-time counts, and 5-point scores for straining and stream strength. [2]
• The prostate: examination by finger, prostate secretions in the laboratory and ultrasound. [2]
• Safety blood tests (chronic prostatitis example): full blood count, clotting tests, blood chemistry and urine tests before and after the course. [2]
• Sexual function and libido: by patient report. [2]

They did not report PSA, symptom scores such as the IPSS, hormone levels or side effects.

Which measures matter, and why?

In community education groups, the more careful educators insist on a PSA baseline (total, free and percent free) before a course, a repeat test 4–6 weeks after it, and stopping after two courses that change nothing. That is educator advice, not a tested plan. Because ejaculation, cycling, infection and a recent biopsy can raise PSA temporarily, tests are usually timed to avoid them. [23]

Health Canada advises anyone who has used an unauthorized injectable drug and has health concerns to consult a health care professional, and to report side effects. [55]

What do people in public communities report?

Public accounts are few, and all the readable first-hand ones are on Reddit. Most describe urinary symptoms, and almost none include a diagnosis, lab results or measured flow. [16], [17], [42], [43]

What do the positive reports look like?

• A user with long-standing dribbling and self-described prostatitis took 750 mcg a day by subcutaneous injection for 3 weeks and described a much better stream, with the effect lasting about six months, after which he started a prostate supplement. [16]
• Another took 750 mcg each morning for three weeks without any tests and went from four night-time trips to one, while also taping his mouth at night and drinking less overnight. [17]
• A man with BPH described less pain and one or no night-time trips after combining Prostamax with a bladder bioregulator. [82]
• The poster of one thread took 5 mg a day by subcutaneous injection and reported a wider stream within about five days; later in the thread he said the gland had not really shrunk but felt less tender. [43]

In community education groups, reports of benefit were also about flow, emptying, urgency and night-time trips, appearing from about one to five weeks into a course. About half of those accounts involved something else at the same time: a bladder bioregulator, tadalafil, large weight loss on GLP-1 medicines or testosterone therapy. Members' own summaries were modest, describing relief rather than a cure.

Does everyone notice a difference?

No. One user with BPH had no benefit from two months of injections and none from Libidon afterwards, and another in a second thread noticed nothing at 1 mg a day. [42], [43] In community education groups, one man felt no effect from a full course and credited his later improvement to losing weight, correcting his hormones and exercising; another took 2 mg a day for about three months with little change and no change on examination. Educators in one group say that no noticeable change is the most likely outcome for this class of peptides.

Someone who said he was starting a course and would report back never posted again, a common pattern that leaves outcomes unknown. [83]

What about unwanted effects?

Two public reports: severe prostate pain in one user and heavy urination on day two in another, both brief and without follow-up. See the risks. [43], [16] The more worrying pattern is not a side effect but a decision: using Prostamax to bring down a raised PSA, or stopping a prescribed medicine, instead of getting checked.

What do community education groups teach?

Educators disagree more than they agree. One group describes Prostamax as the only prostate bioregulator and as made from prostate tissue; in fact it is lab-made, and several prostate extract products exist. Another lists it as a way to act on DHT (a potent male hormone) without androgenic side effects, which the rat data do not support. Claims that it relaxes the muscles of the urinary tract or lowers PSA have no study behind them. More careful lessons stress that the research comes from one institute, that extract and lab-made products are often confused, and that a PSA baseline and a stop rule are essential. [1], [24]

Some lessons reuse seller text or carry purchase links, so enthusiastic lessons are not independent evidence.

How can you judge a prostate story?

Ask: Was there a diagnosis, and was PSA checked before and after? What else changed: a new or stopped medicine, tadalafil, weight loss, evening drinking, testosterone? Was flow or night-time urination counted the same way before and after? Which product, how much and by which route? What happened months later?

These selected discussions are not a survey of all users, a response rate or a substitute for controlled studies. Symptoms vary from week to week, and people are more likely to post when something seems to work.

How does Prostamax compare with Pancragen, Crystagen and Epitalon?

Prostamax belongs to a family of very short peptides from the same Russian program, and some share most of its chain. Pancragen has the same first three amino acids (Lys-Glu-Asp) with a different fourth, and Crystagen is Prostamax's last three (Glu-Asp-Pro). Epitalon is the best-known member of the family. The table compares what each one is and how much has been tested in people.

The real differences are small. All four come from one research network, all rest on small reports without independent repetition, and none has a registered trial with results. Pancragen and Crystagen at least have registered capsule products with stated amounts; Prostamax does not. No study has compared Prostamax with any of them, or with the approved BPH medicines, in people. Prostatilen, Libidon and Vitaprost, which people often mention alongside Prostamax, are animal prostate extracts with no Doserly guide (see the common questions).

Common questions about Prostamax

Is Prostamax the same as Prostatilen, Libidon or Vitaprost?

No. Prostamax is a single lab-made peptide (Lys-Glu-Asp-Pro). Prostatilen is a preparation extracted from animal prostate tissue, which the Prostamax patent names as the product it was designed to replace; Libidon capsules contain a natural prostate “peptide complex”. Research and reviews of those extracts cannot be counted for Prostamax, and a medicine sold as Prostamax in Uzbekistan is itself a prostate extract. [2], [12], [41], [10] See what Prostamax is.

Can Prostamax shrink an enlarged prostate?

It has not been shown in people. One rat study with an unexplained dose found smaller drug-enlarged glands, and the suppository patent reports about 10–13% smaller adenomas in 4 men without a proper comparison. In a public forum, one man taking 5 mg a day said his gland “hasn't really shrunk”. By contrast, US health guidance describes 5-alpha reductase inhibitors, an approved medicine type, as helping stop the growth of or shrink the prostate. [38], [34], [43], [22] See how it might work.

Does Prostamax lower PSA?

No study has measured it. Neither patent reports PSA, and no trial exists. If PSA is raised, the cause needs to be found first: it can come from BPH, prostatitis or cancer, and a lower number on any product does not rule out cancer. [2], [23] See the PSA risk.

Does Prostamax raise testosterone? Is it a steroid?

It is not a steroid or a hormone; it is a four-amino-acid peptide. No study measured testosterone. The only related animal data point the other way: in a rat abstract, seminal vesicles shrank, which the authors called an anti-androgenic effect. [3], [24] See the hormone question.

Is Prostamax a pill or an injection?

In practice, an injection. It is sold as vials of powder to mix with sterile water or as prefilled pens. Capsule doses printed online could not be traced to any product, and a suppository exists only in a patent. [7], [15], [8], [34] See the protocol tables.

How long does Prostamax take to work?

There is no reliable answer. The patent examples measured results after 10–40 days. Public forum users describe changes from about five days to three weeks, and community education group members from about one to five weeks, often while doing other things at the same time. [2], [43], [16] See what people report.

Can Prostamax replace tamsulosin, finasteride or tadalafil?

The reviewed evidence gives no reason to think so. Those medicines are approved treatments for BPH; Prostamax has only patent case series and has never been compared with them. Any change to a prescribed medicine should be agreed with the prescriber. [22], [35], [2] See who should be cautious.

Is it legal to buy Prostamax?

It depends on the country. It is not approved as a medicine in the United States, where FDA has called one seller's Prostamax an unapproved new drug, and Health Canada lists it among seized unauthorized injectable peptides. A “research use only” label does not make a product legal or safe. [9], [55] See the dated legal-status summary.

Glossary

Plain explanations of the route, dosing and research terms used in this guide. Underlined terms in the text link here.

Adverse event

A harmful or unwanted medical event reported after someone used a treatment. A report alone does not prove the treatment caused it.

Alpha blocker

A type of prescription medicine, such as tamsulosin, that relaxes the muscles of the bladder neck and prostate so urine flows more easily. It is a standard treatment for BPH.

Amino acid

A small chemical building block. Chains of amino acids make up peptides and proteins.

Androgen (anti-androgenic)

Androgens are male hormones such as testosterone and DHT. An anti-androgenic effect is one that lowers their activity, for example by shrinking organs that depend on them.

Animal study

Research in animals such as rats or mice. It shows what a substance does in a living body, but results in people can differ.

Bioavailability

How much of a dose reaches the bloodstream in a usable form. It depends heavily on the route. For Prostamax it has not been measured by any route.

Bioregulator

The name a Russian research group uses for very short peptides it believes act on particular tissues. It is a marketing and research label, not a regulatory category.

Blinded

A study design in which participants, and often researchers, do not know who got the treatment and who got the comparison, so expectations cannot sway the results. None of the Prostamax reports describes blinding in people.

BPH (benign prostatic hyperplasia)

Growth of the prostate that is not caused by cancer. It is common with age and can weaken the urine stream and cause frequent or night-time urination. Older papers call it prostate adenoma.

Cell study (in vitro)

Research on cells grown in a dish. It gives early clues about biology, but it is far from proof of benefit in people.

Chromatin

DNA wound around packaging proteins inside the cell nucleus. Tightly packed chromatin keeps genes switched off; loosened chromatin lets them be read.

Compounding

A pharmacy making a medicine for an individual patient from raw ingredients. In the US, pharmacies may only compound with bulk ingredients on FDA's allowed lists; Prostamax is not on them.

Controlled trial

A study that compares people who receive a treatment with a similar group who do not, often receiving a placebo instead. Randomly assigning people to each group makes the comparison fairer.

Course and cycle

A course is the period of repeated use, such as 10 days. A cycle is a course plus a planned break before any further use.

Daily total

All the amounts given in one day, added together. For example, 5 mg twice daily is a 10 mg daily total.

Dose (amount each time)

The amount given on one occasion. A protocol lists both the dose and how often it is given.

Explant

A small piece of tissue kept alive in a dish. Researchers measure how far cells grow out from its edge to compare treatments.

5-alpha reductase inhibitor

A type of prescription medicine, such as finasteride or dutasteride, that blocks the conversion of testosterone to DHT and can shrink an enlarged prostate. It lowers PSA by about half.

Half-life

The time it takes for the measured level of a substance in the blood to fall by half. It is not the same as how long an effect lasts. Prostamax's has not been measured.

Intramuscular (IM)

Injected into a muscle. The patent's patients received Prostamax this way.

Investigational

Still being studied and not approved by a regulator, such as the FDA, to treat any condition.

Freeze-dried (lyophilized)

Dried by freezing and removing the water, leaving a powder. Prostamax vials are sold this way and mixed with liquid before injection.

mcg and mg

Micrograms and milligrams. 1 mg equals 1,000 mcg. Prostamax protocols use both, so check which one a page means.

Oral

Taken by mouth, as a capsule, tablet or liquid.

Peptide

A short chain of amino acids. Prostamax is a chain of four, called a tetrapeptide.

Pharmacokinetics

How the body absorbs, moves, breaks down and removes a substance. For Prostamax, no data exist in any species.

Placebo

A dummy treatment with no active ingredient, used as a comparison in studies. No Prostamax study used one.

Preclinical research

Studies done before research in people: cell studies, tissue cultures, test-tube experiments and animal studies.

Prostatitis

Inflammation of the prostate. It includes chronic prostatitis or chronic pelvic pain syndrome, bacterial infections and inflammation found without symptoms.

PSA (prostate-specific antigen)

A protein made by prostate cells and measured in a blood test. It can rise with prostate cancer, BPH or prostatitis, and briefly after ejaculation, cycling or a biopsy.

Reconstitution

Mixing a freeze-dried powder with a liquid so it can be measured and injected. The amount of liquid sets how much peptide each unit holds.

Rectal

Given into the rectum, for example as a suppository that melts at body temperature.

Research use only

A label on products sold for laboratory research. It does not mean a product is approved, tested for human use or legal to sell as a medicine.

Sister-chromatid exchange

A swap of DNA between the two copies of a chromosome made when a cell divides. Toxicologists have used a rise in these swaps as a sign that a substance may damage DNA.

Seminal vesicles

Two small glands behind the bladder that make most of the fluid in semen. Their size depends on male hormones, so researchers weigh them to judge hormone activity in rats.

Subcutaneous (SC)

Injected into the fatty layer just under the skin. This is the route most people who use Prostamax describe.

Syringe units

Markings on an insulin syringe that measure volume. On a U-100 syringe, 100 units equal 1 mL. The amount of drug per unit depends on the vial's concentration.

Titration

Adjusting a dose in steps, usually starting lower and increasing if needed.

Uroflowmetry

A test that measures how fast urine flows, in millilitres per second, while a person urinates into a special device.

WADA

The World Anti-Doping Agency, which publishes the list of substances banned in sport.

Explore more of the research

Go deeper into the experiments behind the claims.

Across this guide, the citations include 12 original scientific papers on Prostamax: two rat studies, six cell and tissue-culture studies, one test-tube chemistry study and three computer-modelling papers. None reports a study in people. The two patent families, two conference abstracts and three dissertation summaries are counted separately. Paper counts are not counts of independent research teams: nearly all come from one research network and its commercial partner.

How this guide was researched

This guide is built from a thorough review of the sources cited throughout it: published scientific studies, patents, conference abstracts, dissertation summaries, trial-registry searches, regulatory documents, product registers, official labels and published protocol descriptions. We also reviewed public online forums and community education groups where people describe their own experiences with Prostamax.

The guide cites 98 sources, including 16 original scientific papers. Each type of source answers a different question. Studies show what researchers measured. Protocol descriptions show how Prostamax is typically used. Personal accounts show what individual people experienced. Every numbered citation links to its entry below, labeled by source type.

How this guide was made

Research and drafting were AI-assisted. Every cited source was checked against the original, and the guide was reviewed and edited by Doserly before publication. It has not had an independent clinical review, and Doserly does not currently have medical reviewers. Doserly makes a medication and health-tracking app and runs Doserly Academy, both of which are promoted in this guide. Read our editorial policy for how guides are researched, updated and corrected.

This guide is for educational purposes. It summarizes what the reviewed sources report so the research is easier to understand; it is not medical advice. For a deeper dive, or to check any point for yourself, go straight to the cited sources.

Explore the sources