The Russian-developed thymic polypeptide extract — related to but distinct from Thymosin Alpha-1, with decades of Eastern European clinical use in immune restoration and longevity protocols.
Thymalin is a Russian-developed polypeptide extract from bovine thymus gland — a mixture of short peptides rather than a single molecule. Developed at the St. Petersburg Institute of Bioregulation and Gerontology (Khavinson’s group), it’s been used in Russian clinical practice since the 1970s for immune restoration.
Related to but distinct from Thymosin Alpha-1 (which is a single defined 28-amino-acid peptide). Thymalin is a complex extract — less reproducible molecule-for-molecule but with decades of clinical data behind it in its target population.
Approved in Russia. Not FDA approved. Not WADA prohibited. Available through Russian pharmacies and research-peptide suppliers.
Like Thymosin Alpha-1, Thymalin supports maturation of naive T-cells into functional effector cells — compensating for age-related thymic involution that begins in puberty.
Unlike the defined-molecule Tα1, Thymalin delivers a cocktail of thymic peptides. Believed to produce a broader immune-restoration effect but with less precision. Khavinson’s bioregulator framework describes this as "signaling molecules" supporting thymic function rather than a single pharmacological effect.
Shifts Th1/Th2/Treg balance toward age-appropriate regulatory tone. Useful in chronic infection and immune exhaustion contexts.
| Benefit | Evidence |
|---|---|
| Immune restoration | Long-standing Russian clinical use; improved T-cell counts and function in elderly cohorts |
| Mortality reduction | 20-year Russian cohort studies: combined Thymalin + Epitalon associated with reduced all-cause mortality in older adults |
| Chronic infection adjunct | Used in Russian HIV, hepatitis B/C, and chronic viral protocols |
| Age-related decline | Marketed in Russia as a longevity bioregulator |
Most evidence is Russian cohort data; Western RCT replications are limited. Thymosin Alpha-1 has far more Western clinical validation for the same general use cases.
Build your protocol, log every dose, monitor your body's response, and get reminders so you never miss a dose.
Start Tracking FreeIf you have a choice between the two, Tα1 is generally preferred for Western users — single defined molecule, better Western clinical validation, more reliable batch-to-batch. Thymalin is useful if you’re specifically following a Russian bioregulator protocol alongside Epitalon and other Khavinson peptides.
10 mg vial + 2 mL BAC water = 5 mg/mL
| Dose | Volume | Syringe Units |
|---|---|---|
| 10 mg | 2.00 mL | Full 2 mL IM |
| 20 mg | Use undiluted or larger vial | — |
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Generally very well tolerated. Decades of Russian clinical use with minimal reported adverse events.
Thymalin is a research peptide not approved by the FDA for human use. It is sold only as a research chemical, and StackTrax does not endorse or facilitate personal use.
Quality varies enormously among research-chemical suppliers. At minimum, look for:
StackTrax’s preferred partner NextGen Peptides does not currently carry Thymalinin their catalog, which is why you don’t see a direct purchase link here. Other major research-chemical suppliers carry it; we don’t specifically recommend one for this compound.
Build your protocol, log every dose, monitor your body's response, and get reminders so you never miss a dose.
Start Tracking FreeDisclaimer: This guide is for educational and informational purposes only and is not intended as medical advice, diagnosis, or treatment. The compounds discussed are not FDA approved for human use. Always consult a qualified healthcare provider before starting any new supplement or peptide protocol. StackTrax does not sell peptides or supplements directly — purchase links go to third-party vendors. StackTrax is not responsible for the products, quality, or business practices of any third-party vendor. This page contains affiliate links — StackTrax may earn a commission on purchases at no extra cost to you.
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StackTrax guides cover peptides and compounds that are not FDA-approved for the uses discussed. The dosing, reconstitution, and safety information is compiled from published research and community protocols for educational purposes only.
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