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Longevity explainer

What the research says about Testagen

Short research peptide usually marketed as the tetrapeptide Lys-Glu-Asp-Gly (KEDG).

LongevityUpdated 2026-11-09
Original illustration for Testagen research notes: abstract molecular artwork in orange and teal
Original illustration by USA Peptide Vendors; artistic, not a structural model.

What has actually been studied?

KEDG comes out of the Khavinson group's short-peptide work, with limited animal data. Purgo's 20mg listing does not state a sequence, so confirm the analyte on the COA.

How is Testagen thought to work?

Evidence level: Limited: one animal study. All mechanism maps

Testagen (KEDG) mechanism diagramThymus morphology changes in hypophysectomized birds. Targets: Not identified. Mechanism: Not established. Effect reported: Thymus morphology changes.Testagen (KEDG) mechanism mapThymus morphology changes in hypophysectomized birdsTestagen (KEDG)Lys-Glu-Asp-GlyNot identifiedNot establishedThymus morphology changesyoung and old birds [1]Evidence: Limited: one animal study. Numbers in brackets refer to the cited sources.usapeptidevendors.com · Research Use OnlyTARGETMECHANISMEFFECT REPORTED
Assumes Testagen is KEDG; Purgo does not state the sequence. Open SVG
  1. Pateyk AV et al. Effect of peptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the morphology of the thymus in hypophysectomized young and old birds. Bull Exp Biol Med. 2013;154:681-5.

What does the molecule look like?

Purgo does not publish a sequence and PubChem has no record for KEDG, so no chemistry values are shown.

    Verified 2026-11-09 against Pateyk et al. 2013 (PubMed 23658898). Values we couldn't verify are left out.

    Where do US labs buy Testagen?

    What should the certificate show?

    Other questions researchers ask

    What is Testagen?

    Short research peptide usually marketed as the tetrapeptide Lys-Glu-Asp-Gly (KEDG). KEDG comes out of the Khavinson group's short-peptide work, with limited animal data. Purgo's 20mg listing does not state a sequence, so confirm the analyte on the COA.

    Where can US labs buy Testagen?

    Purgo Labs stocks it as “Testagen”; code usapeptidevendors takes 25% off at checkout. This page also lists the best-documented second vendor from our 112-vendor directory.

    Is research-grade Testagen for human use?

    No. Vendor material is sold for Research Use Only, not for human or veterinary use.