Testagen is a synthetic tetrapeptide — Lys-Glu-Asp-Gly (KEDG), roughly 447 Da, molecular formula C17H29N5O9 — that Vladimir Khavinson's St. Petersburg group associated with testis tissue. That name is exactly where most buyers go wrong. Testagen contains no steroid and is not testosterone, does not raise testosterone, and is not an anabolic agent of any kind. It is a short signaling peptide whose published record amounts to a single in-vitro gene-expression paper, with no reproductive-outcome study behind it. If you are shopping for it, the two things worth getting right are what it actually is and what a legitimate vial looks like.
This guide covers what Testagen 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 buying the KEDG tetrapeptide and not the separate Testoluten tissue extract or a mislabeled product. Testagen 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. Testagen 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 Testagen Vendors comparison. This guide teaches you how to evaluate any vendor yourself.
Before You Buy: What Testagen Is Not
Two misconceptions cause almost every bad Testagen purchase, so it is worth settling them before talking price.
It is not testosterone and not a steroid. The name comes from the testis tissue its parent material was drawn from, not from the hormone. Testagen is a four-amino-acid peptide with no steroid nucleus; it is chemically unrelated to testosterone, and there is no published evidence that it raises testosterone or acts like an anabolic. Anyone selling it as a testosterone booster or a "natural steroid" is either confused or misrepresenting the compound — treat that as a reason to walk away from the vendor.
It is not the Testoluten extract. Testoluten is a testis-tissue extract sold in Russia as a supplement capsule (a Khavinson-family "cytamin" bioregulator). Testagen is the synthetic short peptide, KEDG, shipped as a lyophilized powder by Western research vendors. What little clinical framing exists in the Khavinson literature tends to attach to the tissue-extract lineage, not to the synthetic tetrapeptide — so conflating the two overstates what the research chemical has actually been studied for. When you buy Testagen, confirm the listing names the KEDG sequence, not just "testis peptide."
Understanding Testagen Pricing
Testagen is sold as a lyophilized (freeze-dried) powder in sealed glass vials, most commonly in 20mg and 50mg sizes. 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 choosing a reputable seller with a real COA matters more than shaving a few cents off the per-mg cost.
Current Market Pricing (2026)
The ranges below reflect typical research-market listings, not any single vendor's exact number (which goes stale). 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 | $30-65 | $3-6.50/mg | Identity/tolerance testing |
| 20 mg | $40-90 | $2.70-3.40/mg | Most common single-vial purchase |
| 50 mg | $70-150 | $1.40-3/mg | Best per-mg value, 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 peptides — the bigger variable for Testagen is which vendor, not which vial. This guide keeps vial choice framed around price and value; for how a given vial is mixed and how long it lasts, see the Testagen reconstitution guide.
For current vendor-specific pricing with exact $/mg breakdowns, see our Best Testagen Vendors comparison.
How to Verify Testagen Quality
Testagen is a four-amino-acid peptide with molecular formula C17H29N5O9 and a molecular weight of about 447 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 Testagen is not purity; it is identity. You want to confirm the vial contains the KEDG tetrapeptide and not a mislabeled tissue extract or a different Khavinson peptide.
What a COA (Certificate of Analysis) Should Include
Identity Confirmation
- Mass spectrometry confirming the correct molecular weight (about 447 Da; molecular formula C17H29N5O9)
- Amino-acid sequence verification matching Lys-Glu-Asp-Gly (KEDG)
Purity Testing
- HPLC purity — look for 98%+ purity
- 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
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Check the testing lab — Reputable third-party labs include Janoshik Analytical, MZ Biolabs, and Colmaric Analyticals. Avoid vendors who only show "in-house" testing.
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Verify on the lab's website — Janoshik COAs carry a task number that is directly searchable at janoshik.com.
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Check the date — A COA should be recent (within about 6 months) and not a years-old document reused across batches.
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Match the batch — The batch/lot number on the COA should match what is printed on your vial.
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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
- Marketed as a "testosterone booster" or steroid — Testagen is neither; that framing signals a vendor who does not understand the compound
- Product sold only as "testis peptide" or "Testoluten" — that may be the extract or an unspecified product; confirm the KEDG sequence
- A COA whose mass does not match ~447 Da — you may be looking at a different Khavinson peptide or the wrong compound entirely
- No contact information or no return/reship policy — legitimate vendors have real customer service and stand behind their products
