Peptide library / Immune & defense / Thymalin
Thymalin
A thymus extract developed in the Soviet Union and promoted as an immune bioregulator.
Effects studied or claimed
What it is used or promoted for, and where each effect has actually been seen
- Immune supportSmall human studies
- Aging, promotedSmall human studies
How it is thought to work
Thymalin is a mixture of thymus peptides said to support T cell function, though its active components are not defined.
What the evidence shows
Evidence comes largely from Russian studies by the Khavinson group.
Safety and unknowns
Human safety data outside Russia are limited.
Regulatory status
Registered in Russia. Not approved elsewhere.
Regulatory status changes quickly. This entry was last reviewed on 27 October 2026. Confirm current status with the FDA before relying on it.
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General information, not medical advice. Do not buy or inject unregulated peptides.