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Research-onlyVendors pendingFacts verified · 2026-05-25

Testagen

Also known as kedg

Testagen is a synthetic tetrapeptide (Lys-Glu-Asp-Gly, KEDG) from the Khavinson short-peptide bioregulator family, originally derived from testicular tissue extracts. It is marketed in Russia for support of male reproductive function, androgen production, and immune-endocrine balance in aging men. There are no Western controlled clinical trials, no FDA approval, and essentially all published work originates from the Khavinson institute in St. Petersburg. Reported pharmacology should be regarded as hypothesis-generating rather than established, and the compound is treated as research-only outside Russia.

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Mechanism of action

Testagen is a synthetic KEDG tetrapeptide developed by Khavinson at the St. Petersburg Institute of Bioregulation and Gerontology, derived from testicular tissue extracts.

Testagen is a synthetic KEDG tetrapeptide developed by Khavinson at the St. Petersburg Institute of Bioregulation and Gerontology, derived from testicular tissue extracts. According to the Khavinson framework (PMID 27909961, PMID 19827673), short peptides penetrate cell and nuclear membranes and bind directly to specific DNA promoter regions to modulate gene expression in tissues from which they were derived — for Testagen, Leydig cells, spermatogenic epithelium, and reportedly prostate. Mechanistic claims (direct DNA binding by tetrapeptides) are based on Russian research and have not been independently replicated in Western peer-reviewed structural biology.

Pharmacokinetic properties

Half-life

Unknown — no published pharmacokinetic data in peer-reviewed Western literature

Routes

subcutaneous · oral · sublingual

Bioavailability

Khavinson short peptides are reported to be active orally; vendor-supplied material is typically dosed SC or sublingually. PK profile is not formally characterized.

Amino-acid sequence

H-Lys-Glu-Asp-Gly-OH (KEDG)

Use & research dosing

Metabolic Support

Russian clinical literature and self-experimentation reports describe 1-10 mg per day (oral or SC) in 10-30 day cycles, often 2-3 cycles per year. Russian protocols have used these schedules in chronic prostatitis and age-related androgen-decline settings. No FDA-approved dose exists and no Western pharmacokinetic data are available. Vendor capsule and lyophilized formulations vary widely in actual peptide content. Research framing only.

Research-use framing only. SavePeptides sells nothing for human consumption. Doses above reflect reported research / self-experimentation ranges, not clinical recommendations.

Editorial perspective

Current state: Testagen is a Khavinson research peptide with essentially no Western clinical or pharmacokinetic data. Russian clinical claims around male reproductive and androgen support are unreplicated in mainstream endocrinology. Should not be framed as a substitute for evidence-based hypogonadism treatment, and direct DNA binding claims should be treated as unconfirmed.

— SavePeptides editorial desk · last updated 2026-05-25

Cautions & contraindications

Before researching this compound, note:

  • Active or suspected prostate cancer or hormone-sensitive malignancy — avoid
  • Almost all efficacy data come from the Khavinson group; independent replication essentially absent
  • No published Western human PK or controlled safety data — limited safety data flag
  • Not a substitute for evaluation of hypogonadism with proper endocrine workup
  • Pediatric use and use in non-target populations — no data
  • Vendor purity, peptide identity, and endotoxin levels variable
  • Mechanistic claim of direct DNA binding by short peptides is unverified independently

Research foundation

The papers behind the page.

  1. [01]https://pubmed.ncbi.nlm.nih.gov/19827673/
  2. [02]https://pubmed.ncbi.nlm.nih.gov/27909961/

Facts verified

2026-05-25

Confidence

low

What this means

  • evidence base is primarily Russian-language / Khavinson institute
  • limited safety data
  • no Western controlled trials
  • mechanistic claims unverified independently

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Research-use disclaimer.

SavePeptides surfaces vendor, pricing, and coupon information for research compounds. These products are not intended, approved, or recommended for human consumption. Our content is informational only and does not constitute medical advice.

Testagen · SavePeptides