Educational content only — this is not medical advice. Nothing here is a recommendation to buy, obtain, or use Thymalin. Talk to a licensed clinician before making health decisions.
What it is
Thymalin is a complex of polypeptides isolated from calf thymus or produced synthetically. It is used in some Eastern European countries as an immunomodulator, often in combination with other thymic or pineal peptides.
What the evidence shows
Small Russian and Eastern European studies suggest immune-modulating and possibly geroprotective effects, including changes in T-cell subsets and morbidity. Western independent replication and large RCTs are lacking. Evidence should be considered preliminary.
Risks & unknowns
Reported adverse effects are uncommon and include injection-site reactions and mild fever. Because it is derived from animal tissue or unregulated synthetic sources, purity and immune reactions are concerns.
Legal / regulatory status
Thymalin is not FDA-approved. It is approved in some countries for immune modulation. It may be prohibited by WADA under S2 depending on formulation.