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Thymalin

Thymic polypeptide bioregulator (calf-thymus extract)

Research useEducational entry
Mechanism

A complex of low-molecular-weight polypeptides extracted from calf thymus, studied as a thymic immunomodulator; its short peptides (e.g. Glu-Trp) are proposed to influence T-cell differentiation and gene expression in preclinical models.

Evidence

Most evidence comes from Russian clinical and gerontology research; independent large-scale replication is lacking. Not an approved drug in the US/EU.

Applications
  • Studied for immune modulation (T-cell counts, CD4/CD8 ratio)
  • Gerontology/aging research
  • Explored as adjunct in severe COVID-19 immune dysregulation studies
Protocol

Educational overview only — no dosing instructions in the public hub.

Risks

Animal-derived extract with limited independent safety data; long-term human safety, immunogenicity and sourcing/purity are the main practical risks.

Quality

Third-party CoA (identity + purity + MS) is the minimum verification; extract composition can vary batch to batch.

Legal status

Registered as a medicine in Russia and some CIS countries; not approved by the FDA or EMA. Research-use-only in most other jurisdictions.

✓ Last reviewed · 2026-07-21

Frequently asked questions

What is Thymalin used for?
Studied for immune modulation (T-cell counts, CD4/CD8 ratio). Gerontology/aging research. Explored as adjunct in severe COVID-19 immune dysregulation studies. Most evidence comes from Russian clinical and gerontology research; independent large-scale replication is lacking. Not an approved drug in the US/EU.
Is Thymalin legal in Europe?
Registered as a medicine in Russia and some CIS countries; not approved by the FDA or EMA. Research-use-only in most other jurisdictions.
What are the risks and side effects of Thymalin?
Animal-derived extract with limited independent safety data; long-term human safety, immunogenicity and sourcing/purity are the main practical risks.
How is the quality of Thymalin assessed?
Third-party CoA (identity + purity + MS) is the minimum verification; extract composition can vary batch to batch.