PeptideInjectableBioregulator peptideReproductive

Testagen

Also known as KEDG peptide · Lys-Glu-Asp-Gly

Written by enwyReviewed 5 Aug 20261 sources0 comments

Testagen (Lys-Glu-Asp-Gly) is a synthetic Khavinson bioregulator peptide marketed for testicular/reproductive support. Evidence is limited to preclinical work and Russian reports; no independent human trials exist, and it is not a testosterone-boosting drug in any validated sense.

01 Overview

Testagen is a tetrapeptide bioregulator claimed to target the testes and support reproductive function and spermatogenesis. Developer-group animal studies report effects on testicular tissue and gene expression.\n\nDespite marketing that implies hormonal enhancement, there is no independent human trial evidence that Testagen raises testosterone or improves fertility. It is sold as a research peptide.

02 Mechanism

Proposed tissue-specific regulation of testicular cell gene expression; no validated effect on the HPG axis or serum testosterone.

03 Dosing

Tier	Dose	Route	Notes
Anecdotal	5–10 mg/day	IM	Short cycled courses per vendor protocols; no clinical basis.

04 Effects

Effect	Magnitude	Evidence
Testicular tissue supportReported effects on testicular tissue in animal models.	n/a	Preclinical
Fertility/reproductive claimMarketed for spermatogenesis support; unverified in humans.	n/a	Anecdotal

05 Side effects

Effect	Severity	Frequency	Evidence	Countermeasures
Unfounded hormonal expectationsUsers may expect testosterone increases that the peptide has not been shown to produce, delaying real evaluation of hypogonadism.	Mild	Situational	Unconfirmed
Injection-site reactionLocal irritation at injection sites.	Mild	Common	Anecdotal

06 Legal status

United States

Not FDA-approved

Research use only. · as of Jan 2026

07 References

Organ-specific peptide bioregulators (Khavinson series) reviewBull Exp Biol Med

08 Discussion0 comments

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This page is reference information, not medical advice. Doses and protocols are documented as they appear in the clinical literature and in practice — describing them is not a recommendation to use them. Countermeasures listed here are not a substitute for a physician. Legal status varies by jurisdiction and changes.