Also covered
88/100May 2026 review (v3.0 rubric); v4.1 re-score pending
Starting at $160/mo. Defy Medical is one of the providers covered in our editorial directory that dispenses or coordinates Thymalin.
Read review →Longevity · Thymic
Thymalin
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Thymalin is a complex of thymic peptides extracted from calf thymus, studied for immune restoration in elderly and immunocompromised patients. Used clinically in Russia and Eastern Europe.
Thymalin at a glance
Thymalin is a complex of thymic peptides extracted from calf thymus, studied for immune restoration in elderly and immunocompromised patients. Used clinically in Russia and Eastern Europe. Mechanism: Thymic peptide complex. Typical route: Intramuscular. FDA status: Not FDA-approved. Approved and used in Russia and former Soviet states. Imported by some U.S. compounding and integrative-medicine practices for off-label use.
Drug classThymic peptide complex
Half-lifeVaries (cocktail)
RouteIntramuscular
Common dosing10-30 mg, 5-10 day course
FDA statusNot approved (US)
Russia approvalYes, immune indications
Mechanism of action
Thymalin acts on T-cell maturation and immune balance, restoring age-related decline in thymic function. Russian clinical studies report decreased infections and improvements in markers of immunosenescence in elderly subjects.
Dosing reference
Intramuscular: 10-30 mg per dose, given 5-10 days as a treatment course, then off for 2-6 months. Specific dosing varies by indication.
Dosing information is provided for educational reference and is not medical advice. Patients should not initiate or modify any peptide regimen without consulting a licensed clinician. See our medical disclaimer.
FDA status & regulatory framework
Not FDA-approved. Approved and used in Russia and former Soviet states. Imported by some U.S. compounding and integrative-medicine practices for off-label use.
U.S. telehealth providers that work with Thymalin
Also covered
85/100May 2026 review (v3.0 rubric); v4.1 re-score pending
Starting at $180/mo. Marek Health is one of the providers covered in our editorial directory that dispenses or coordinates Thymalin.
Read review →Also covered
68/100May 2026 review (v3.0 rubric); v4.1 re-score pending
Starting at $199/mo. BreezeMeds is one of the providers covered in our editorial directory that dispenses or coordinates Thymalin.
Read review →Also covered
80/100May 2026 review (v3.0 rubric); v4.1 re-score pending
Starting at $149/mo. Hone Health is one of the providers covered in our editorial directory that dispenses or coordinates Thymalin.
Read review →Related longevity peptides
Frequently asked questions about Thymalin
Is Thymalin the same as Thymosin Alpha-1?
No. Thymalin is a complex of multiple thymic peptides extracted from calf thymus. Thymosin Alpha-1 is a single defined peptide. The two have overlapping but distinct immune effects.
Where is Thymalin used clinically?
Thymalin has been used in Russian and Eastern European clinical practice for decades, particularly for elderly immune-decline indications. U.S. use is off-label through compounding pharmacies.
References
- Peptides and CCL11 and BDNF as targets in the elderly correction. Adv Gerontol. 2020;10(2):203-208. PMID: 33274879
- Peptide bioregulation of aging: results and prospects. Biogerontology. 2010;11(2):139-149. PMID: 19543815
Sources are peer-reviewed where available. PubMed (PMID) links resolve to NCBI's PubMed database. FDA links resolve to the U.S. Food and Drug Administration. Citations were last verified 2026-05-11.