Prostamax is a synthetic tetrapeptide — Lys-Glu-Asp-Pro (KEDP), roughly 487.5 Da, molecular formula C20H33N5O9 — sold in the Khavinson bioregulator family and marketed for prostate-tissue research. That marketing is exactly where most buyers go wrong: the prostate clinical record belongs almost entirely to Prostatilen (sold as Vitaprost in Russia), a prescription extract of animal prostate tissue, while Prostamax is a short synthetic peptide whose own published record is thin. The most-cited study on the synthetic KEDP peptide is an in-vitro chromatin experiment in cells from older donors, not a prostate-outcome trial. If you are shopping for one product, be sure you are not paying for the other and assuming the wrong evidence base.
This guide covers what Prostamax typically costs on the research market, how to verify a certificate of analysis for a peptide this simple, and — most importantly — how to confirm you are actually buying the KEDP tetrapeptide and not a mislabeled prostate extract or a different Khavinson peptide. Prostamax is niche enough that vendor quality varies a lot, so knowing what a real COA looks like is the single most useful skill here.
Research-context information only. Prostamax is a research peptide. Protocols, doses, and reactions reported below come from published research and self-reported community sources. This article reports what has been documented, not what should be done. Consult a licensed physician for personal medical decisions.
Affiliate disclosure: Some links below route to vendor partners, and we may earn a commission if you buy through them at no extra cost to you. That never changes what we report about a vendor's COA, pricing, or track record. All products discussed are research chemicals labeled "not for human consumption."
This is not a ranked vendor list — for that, see our Best Prostamax Vendors comparison. This guide teaches you how to evaluate any vendor yourself.
Understanding Prostamax Pricing
Prostamax is sold as a lyophilized (freeze-dried) powder in sealed glass vials. Because it is a niche Khavinson bioregulator rather than a mainstream peptide, fewer vendors stock it, and prices are less compressed than they are for high-volume compounds like BPC-157 or semaglutide. That means two things: per-mg pricing swings more from vendor to vendor, and vial-size selection matters less than simply finding a reputable seller with a real COA.
Current Market Pricing (2026)
The ranges below reflect typical research-market listings, not any single vendor's exact number (which goes stale). These are value comparisons only, not a suggestion about how much to use. For live per-mg pricing, use the comparison pages linked under the table.
Vial Size
Typical Price Range
Price Per mg
Best For
10 mg
$22-50
$2.20-5/mg
Identity/tolerance testing
20 mg
$30-70
$2.70-3.00/mg
Most common single-vial purchase
50 mg
$50-120
$1-2.40/mg
Best per-mg value for repeat buyers
The pattern is the usual one: the larger vial lowers the per-mg cost because base synthesis cost is nearly flat, but the spread is smaller than it is for cheaper mainstream peptides — the bigger variable for Prostamax is which vendor, not which vial.
Prostamax is a four-amino-acid peptide with molecular formula C20H33N5O9 and a molecular weight of about 487.5 Da. It is short, simple, and cheap to synthesize — which means a legitimate certificate of analysis is easy for any competent vendor to produce, and the absence of one is a red flag rather than an excuse. The bigger verification challenge with Prostamax is not purity; it is identity. You want to confirm the vial contains the KEDP tetrapeptide and not a mislabeled prostate extract or a different peptide sold under a prostate-themed name.
What a COA (Certificate of Analysis) Should Include
Identity Confirmation
Mass spectrometry confirming the correct molecular weight (about 487.5 Da; molecular formula C20H33N5O9)
The chromatogram should show a single dominant peak with minimal impurities
Contamination Testing
Endotoxin levels (bacterial contamination)
Residual solvent analysis (acetonitrile, TFA)
Heavy-metals screening
How to Verify a COA Is Legitimate
Check the testing lab — Reputable third-party labs include Janoshik Analytical, MZ Biolabs, and Colmaric Analyticals. Avoid vendors who only show "in-house" testing.
Verify on the lab's website — Janoshik COAs carry a task number you can look up directly at janoshik.com.
Check the date — A COA should be recent (within about 6 months) and not a years-old document reused across batches.
Match the batch — The batch/lot number on the COA should match what is printed on your vial.
Look for the original PDF — Full PDFs with lab letterhead and signatures are much harder to fake than a cropped screenshot.
Red Flags to Avoid
No COA available — inexcusable for a peptide this cheap to synthesize and test
Only in-house testing — self-reported purity numbers are meaningless
Product sold simply as "Prostatilen," "Vitaprost," or "prostate peptide" — that is the tissue extract or an unspecified product, not the KEDP tetrapeptide; confirm the sequence
A COA whose mass does not match ~487.5 Da — you may be looking at a prostate extract or the wrong compound entirely
No contact information — legitimate vendors have real customer service
No return or reship policy — reputable vendors stand behind their products
20mg · sold research-use-only · we may earn a commission
Prostamax vs Prostatilen: Don't Buy the Wrong Product
This is the caveat that matters most for a Prostamax purchase, so it is worth stating plainly before checkout. Two different products get blurred together in vendor listings and forum posts:
Prostatilen (Vitaprost) — a polypeptide extract of animal prostate tissue, sold as a prescription product in Russia and some Eastern European countries. This extract carries essentially all of the published prostate clinical work.
Prostamax — the synthetic KEDP tetrapeptide (Lys-Glu-Asp-Pro) associated with the Khavinson bioregulator program. Its own most-cited data is an in-vitro chromatin study in cells from older donors, not a prostate-outcome trial.
They are not the same molecule, and they do not share an evidence base. The synthetic peptide you buy from a Western research vendor is Prostamax, and the human prostate data you may have read about most likely belongs to the extract. Before buying, confirm from the COA that the sequence is KEDP and the mass is ~487.5 Da — that single check tells you which product is actually in the vial.
Choosing the Right Vial Size
For a niche bioregulator like Prostamax, vial-size choice is a price-and-freshness decision, not a dosing one. The two things that drive it are per-mg cost (larger vials are cheaper per milligram) and reconstituted stability (once mixed, the solution has a limited shelf life). For the mixing math and how long a reconstituted vial keeps, see the Prostamax reconstitution guide — this buying guide stays on price and value.
The 28-Day Rule
Once reconstituted with bacteriostatic water, small stable tetrapeptides like Prostamax are generally kept refrigerated and used within about 28 days; sterile water (no preservative) shortens that window sharply. The practical takeaway for a purchase decision: a larger vial only saves money if it actually gets used inside that window. If a 50mg vial would sit half-used past its stability window, the per-mg savings on paper never materialize.
Recommended Vial Size by Value
Identity / tolerance testing:
A 10mg vial is the low-commitment option to confirm sequence identity from the COA and check out a vendor before spending more.
Most single purchases:
A 20mg vial is the common pick — better per-mg value than 10mg without committing to a large quantity of one vendor's product.
Repeat buyers:
A 50mg vial offers the best per-mg value if you already trust the vendor, but only if the reconstituted solution can be used within its stability window rather than sitting in the fridge.
Buying Multiple Smaller vs One Large Vial
Factor
Multiple Small (e.g., 2-3× 20mg)
One Large (1× 50mg)
Cost per mg
Higher
Lower
Freshness
Reconstitute as needed
Must use within stability window
Flexibility
Pay as you go
Buy once
Storage
Easier (smaller volumes)
Standard
Shipping
More frequent orders
Single shipment
Our take: for a niche peptide like Prostamax, buying a 20mg vial at a time from a vendor with a verifiable KEDP COA usually beats chasing the marginal per-mg savings of a 50mg vial — the freshness and lower up-front risk are worth more here than they are on a high-volume compound.
Vendor Evaluation Methodology
When comparing Prostamax vendors, we weight three factors:
Price Competitiveness (40%)
We normalize to cost per milligram so vials of different sizes compare fairly. Because Prostamax's price spread is driven more by vendor than by vial size, the cheapest legitimate seller with a real COA usually wins this category outright.
COA & Testing (30%)
We check that COAs are from recognized third-party labs, recent (within about 6 months), verifiable on the lab's website, batch-matched to the vial, and — critically for this compound — that they confirm the ~487.5 Da mass and the KEDP sequence rather than a generic "prostate peptide" or the Prostatilen extract.
Reputation (30%)
Community feedback from peptide forums, shipping reliability, customer-service responsiveness, and business track record. We give extra weight to vendors who label Prostamax clearly as the synthetic KEDP tetrapeptide and distinguish it from the Prostatilen/Vitaprost extract instead of blurring the two.
Shipping and Storage
What to Expect When Your Order Arrives
Lyophilized Prostamax should arrive as a white or off-white powder cake in a sealed glass vial. Check:
Vial integrity — no cracks, intact rubber stopper and aluminum crimp cap
Powder appearance — a solid cake or loose powder, NOT liquid or discolored
Labeling — batch/lot number, milligram content, and "for research use only"
Cold pack — reputable vendors ship with cold packs in warm months
Storage Guidelines
State
Temperature
Duration
Lyophilized (powder)
Room temp
Weeks (shipping window)
Lyophilized (powder)
Refrigerated (2-8°C)
12-24 months
Lyophilized (powder)
Frozen (-20°C)
2+ years
Reconstituted (BAC water)
Refrigerated (2-8°C)
~28 days
Reconstituted (sterile water)
Refrigerated (2-8°C)
~24 hours
Key point: keep unreconstituted vials refrigerated, and reconstitute only what a research protocol will use inside the stability window. Prostamax's low per-mg cost makes it easy to buy fresh rather than stockpile reconstituted solution.
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Frequently Asked Questions
Is Prostamax legal to buy?
Prostamax is sold as a research chemical and is legal to purchase in most jurisdictions for laboratory research purposes. It is not FDA-approved in the United States and has no approved counterpart in Western markets. Research vendors label the product 'not for human consumption.' The synthetic KEDP tetrapeptide is distinct from Prostatilen/Vitaprost, the prostate tissue extract sold as a prescription product in Russia.
What's the difference between Prostamax and Prostatilen?
Prostatilen (marketed as Vitaprost in Russia) is a polypeptide extract of animal prostate tissue used there as a prescription product, and it carries essentially all of the published prostate clinical data. Prostamax is a synthetic four-amino-acid peptide, Lys-Glu-Asp-Pro (KEDP), associated with the Khavinson bioregulator program. They are different products with separate evidence bases: the extract has the prostate-outcome studies, while the synthetic Prostamax has no verified prostate-outcome study of its own. Buying one when you meant the other is the most common Prostamax mistake.
How much does Prostamax cost?
As a niche Khavinson tetrapeptide, Prostamax is stocked by fewer vendors than mainstream peptides, so pricing is less compressed. A 20mg vial typically runs $30-70 and a 50mg vial $50-120, which works out to roughly $1-3.50/mg depending on vial size and vendor. Check the live /best/prostamax and /prices/prostamax pages for current per-mg numbers.
What purity and identity should a Prostamax COA show?
Look for third-party HPLC purity of 98%+ and mass spectrometry confirming the correct molecular weight, about 487.5 Da for the KEDP tetrapeptide (molecular formula C20H33N5O9). The sequence should read Lys-Glu-Asp-Pro. Because this is a short, simple peptide that is cheap to synthesize, there is no good reason for a vendor to skip a batch-matched third-party COA.
Can I buy Prostamax from a pharmacy?
Not in the United States. There is no FDA-approved Prostamax product. The related Prostatilen/Vitaprost prostate extract is a prescription product in Russia and parts of Eastern Europe, but the synthetic Prostamax tetrapeptide is only available in Western markets through research-peptide vendors, not pharmacies.
This article is for educational and informational purposes only. It is not medical advice and should not be used to diagnose, treat, or prevent any condition. Consult a licensed healthcare provider before using any peptide.
