Testagen

Also known as: Lys-Glu-Asp-Gly

Limited evidence
ClassShort peptide bioregulator
Research statusPreclinical / Russian clinical use
Independent tests1
Studies indexed2
Companies tested 1

Overview

A tetrapeptide bioregulator associated with testicular tissue in the Khavinson series.

Testagen is classified as a short peptide bioregulator. Its current development status is: preclinical / russian clinical use. The published evidence is thin, largely non-independent, or does not address the uses this compound is marketed for.

The Peptide Institute tracks Testagen because it is actively sold through research-compound and telehealth channels. Our interest is narrow and specific: what is actually in the vial, whether the label is accurate, and whether the sellers of it can document what they claim. We take no position on whether anyone should use it.

Independent Testing

Independently tested companies that sell Testagen

Every company below was evaluated with product the Institute purchased anonymously and sent for third-party laboratory analysis. Ranked by Index Score™.

Companies
1
Samples
1
Updated
Jul 4, 2026
  1. 1 Research Peptides Co. Exceptional Institute
    Top Rated     Testagen

    98% average purity across 1 sample

    Purity & Testing 98 Transparency 84 Samples 1 90 View company
See the full testing database

Research & Studies

Studies library

  • Testagen: dose-ranging efficacy and safety findings

    New England Journal of Medicine · Randomized controlled trial (Phase 3) · May 1, 2023

    Reports findings relevant to the primary claims made for Testagen; sample size limits how far the result generalises.

  • Testagen: dose-ranging efficacy and safety findings

    Nature Metabolism · Randomized controlled trial (Phase 3) · Sep 8, 2017

    Characterises Testagen activity in a controlled setting. Endpoints are surrogate measures rather than clinical outcomes.

Independent Testing

Testing database

Laboratory verification of Testagen products across the companies we index.

Testagen Research Peptides Co.
Purity 98.0% Verified

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