Testagen

Testes & pituitary Research only Preliminary Synthetic short peptide (Cytogen)

Also called KEDG peptide

A four-amino-acid Khavinson peptide associated with the testes. Animal reports describe effects on the pituitary, including thyroid-stimulating hormone and thyroid hormone levels, and it is promoted for supporting testosterone, although published evidence for that is thin.

Evidence at a glance

Evidence: Preliminary — Very little published work
Status: Research compound only
Dosing: No human study has set a dose

Promoted for testosterone support, but published evidence for that specific claim is thin.

What studies report

Reported effects on pituitary output of thyroid-stimulating hormone in animals

How it works

A Khavinson short peptide: at two to four amino acids it is small enough to pass through cell and nuclear membranes intact. The proposed mechanism is that it binds specific sites on nuclear DNA and changes which genes are switched on in its target tissue, rather than acting on a surface receptor the way most peptides do.

Small enough to pass through and act on DNA in the nucleus

Where it acts

Testes

The library groups this compound under Testes & pituitary. The diagram shows that target, not every tissue it reaches.

Illustrated

Histology-inspired illustration of endocrine cells and capillaries.

AI-generated subject illustration; not a depiction of the compound or evidence of its effects.

Why people take it

Testosterone supportThyroid hormone

Reasons people seek it out — not a list of proven effects.

Status: Limited animal data, mostly from one research group.

Route: Subcutaneous injection, or oral capsule depending on the preparation
Sequence: Lys-Glu-Asp-Gly
Formula: C17H29N5O9
Molecular weight: 447.4 g/mol
Available as: 20 mg

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Educational information only. Nothing here is medical advice, a dosing protocol, or a recommendation to use any compound. Most entries describe substances not approved for human use. Talk to a licensed clinician before acting on anything you read here. How to read these entries.