Testagen — EU research guide.
Testagen is a synthetic tetrapeptide (Lys-Glu-Asp-Gly) from the Khavinson bioregulator series, proposed to interact with anterior pituitary gonadotroph cells in ways that support testosterone and TSH synthesis. It is studied in hypogonadism-related models as part of the same research family as Prostamax.
What is Testagen?
Testagen is a synthetic tetrapeptide (Lys-Glu-Asp-Gly) from the Khavinson bioregulator series, proposed to interact with anterior pituitary gonadotroph cells in ways that support testosterone and TSH synthesis. It is studied in hypogonadism-related models as part of the same research family as Prostamax.
What does the research show?
Available data is limited to small animal studies from Eastern European groups. No independently replicated controlled human trial data is publicly available as of mid-2026, in contrast to established hormonal-axis compounds like Gonadorelin.
EU legal status
Not approved as a medicine anywhere in the EU. Sold by a small number of specialist research vendors for laboratory use only.
Molecular information
Pharmacokinetics
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