Thymalin
Last reviewed June 3, 2026
Also known as: Thymus extract, TFX, Thymic factor X
Quick Answer
Thymalin is a thymic peptide research compound (not FDA-approved for human use) studied for immune restoration. Thymalin is a polypeptide extract from the thymus gland studied in Russian research for restoring immune function and extending healthspan, particularly in aging populations. Research dose: 10–10 mg daily x 10 days. Half-life: not established. Available from COA-verified vendors with code PEPTIDEX for up to 20% off.
Where to Source
Ranked by $/mgSourcing data for Thymalin is updating.
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Where to Source
Ranked by $/mgSourcing data for Thymalin is updating.
We verify new listings weekly — check back soon.
Polypeptide extract from animal thymus gland containing a mixture of thymic hormones including thymulin, thymosin, and thymopoietin. Restores thymic function, promotes T-cell differentiation and matur
Where to Buy Thymalin
COA-verified vendors · Use code PEPTIDEX for up to 20% off
Verified pricing for Thymalin is not yet available in our database. Browse all COA-verified vendors on our price comparison tool, or check individual vendor pages.
Compare All Vendors§ Mechanism of Action
Polypeptide extract from animal thymus gland containing a mixture of thymic hormones including thymulin, thymosin, and thymopoietin. Restores thymic function, promotes T-cell differentiation and maturation, and modulates the balance between Th1/Th2 responses. Khavinson bioregulatory peptide research documents anti-aging effects via neuroendocrine-immune system normalization.
§ Primary Benefits
- 1Immune restoration
- 2longevity
- 3thymic function support
- 4T-cell maturation
§ Clinical Evidence
Thymalin reduces mortality and extends lifespan in elderly patients: 6-year follow-up
Morozov et al.: 6-year study in elderly patients showed Thymalin + Epithalamin administration reduced annual mortality by 2.0–2.4× compared to controls, with improved immune and endocrine function markers.
EmergingThymic peptides in aging and immune restoration
Khavinson et al.: Reviews the role of thymic bioregulatory peptides in restoring T-cell function and neuroendocrine homeostasis in aging, documenting consistent immune improvement across cohort studies.
Emerging§ Safety Profile
Based primarily on Russian clinical cohort studies (Khavinson et al.). Limited Western RCT validation. Generally well tolerated in published research. Not FDA-approved. Research only. Caution: Russian bioregulatory research base has limited reproducibility in Western trials.
See our evidence grading methodology for how we evaluate and grade peptide safety data.
§ Dosing Protocol
* Dosing data from published literature — not a human use recommendation.
RouteIM
Dose Range10000–10000 mcg
FrequencyDaily x 10 days
Cycle Length1–1 weeks
Khavinson protocol: 10mg IM daily for 10 days, repeated 1–2x per year. No validated Western dosing protocol.
§ Expected Outcomes
Weeks 2–4
T-cell count normalization; improved immune markers in Russian cohort studies
Month 2–3
Sustained immune function improvement over 6-month follow-up
§ Adverse Effects
| Side Effect | Incidence | Severity |
|---|---|---|
Injection site reaction | ~5% | mild |
Where to Source Thymalin for Research
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Cite This Page
⚠️ Educational only · Not medical advice · For research use only. Information on this page is compiled from peer-reviewed literature and is intended strictly for educational and informational purposes. Peptides discussed may be unapproved research chemicals — consult a licensed healthcare professional before considering any peptide compound. Read our full disclaimer
Affiliate disclosure: PeptiDex may earn commissions from purchases made through vendor links on this page. This does not affect our editorial ranking or vendor recommendations — we exclusively feature vendors that pass independent COA verification. See our methodology · Editorial policy
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