Immune & gut · Aging & longevity
Thymalin, simplified.
Also called Thymulin-related thymus peptides
Early researchA mix of small peptides from the thymus, the gland that trains immune cells. It has been used in Russia for decades to support immunity.
- Size
- Mix of short thymus peptides
- How it is taken
- Injection
- Status
- Rx in Russia, research elsewhere
- Available sizes
- Vials: 10 mg
What is it?
Your thymus shrinks with age, which is one reason immunity weakens. Thymalin is a peptide extract from the thymus developed by Russian researchers, who also developed Epitalon.
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What studies show
- In peopleRussian studies report improved immune markers in older adults and people with weak immunity.
- In peopleRussian long-term studies in older adults reported lower death rates, but the studies were small and not well controlled.
What we don’t know yet
- Results from independent, well-controlled trials outside Russia.
Side effects and cautions
- Little Western safety data.
- Product quality varies.
Is it legal?
Not FDA-approved.
Dosage & schedule evidence
How to read published schedules
Third-party protocols are not established clinical dosing standards. Safe human dose, frequency, and duration may be unknown. Research findings may not translate to safe or effective personal use.
| Measurement | Meaning |
|---|---|
| 1 mg | 1,000 mcg (mass) |
| 100 U-100 units | 1 mL (volume, not dose) |
See third-party published protocols ↗ for research context. North Star does not validate these schedules.
Consult your doctor before considering any peptide for personal use. Educational only, not administration guidance.
Common questions
What is Thymalin?
A mix of small peptides from the thymus, the gland that trains immune cells. It has been used in Russia for decades to support immunity. Your thymus shrinks with age, which is one reason immunity weakens. Thymalin is a peptide extract from the thymus developed by Russian researchers, who also developed Epitalon.
What does the research say about Thymalin?
Russian studies report improved immune markers in older adults and people with weak immunity. Russian long-term studies in older adults reported lower death rates, but the studies were small and not well controlled.
Is Thymalin FDA approved?
Not FDA-approved.
What are the side effects of Thymalin?
Little Western safety data. Product quality varies.
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This page explains published research in plain language. It is not medical advice, a diagnosis, or a recommendation to take anything, and it does not give dosing. Most peptides here are not FDA-approved, and products sold online vary widely in purity. Rules around peptides are changing, so check the current status and talk with a licensed clinician before starting anything. Last reviewed 2026-10-19.