Thymalin vs Thymulin
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
Thymalin
Thymalin is a polypeptide preparation derived from calf thymus. Developed in Russia, it has been used for decades to support immune function and has shown potential anti-aging effects in long-term studies.
Full details →Thymulin
Thymulin (Facteur Thymique Sérique) is a zinc-dependent nonapeptide hormone produced by thymic epithelial cells. It plays important roles in T-cell differentiation and immune system maturation.
Full details →Side-by-Side Comparison
| Aspect | Thymalin | Thymulin |
|---|---|---|
| Dose Range | 5 mg–10 mg | 100 mcg–400 mcg |
| Frequency | 1x daily | 1x daily |
| Cycle Length | 1–2 weeks | 4–8 weeks |
| Route | intramuscular | subcutaneous |
| Mechanism | Regulates the ratio of T-cell subpopulations, stimulates cellular immunity, and enhances phagocytosis. Also affects neuroendocrine regulation and may influence melatonin production. | Requires zinc for biological activity. Promotes T-cell differentiation, modulates cytokine production, and influences neuroendocrine function. Levels decline significantly with age. |
| Typical Dosage | Clinical protocols: 5-20mg daily intramuscularly for 3-10 days. Often cycled 1-2 times per year for maintenance. | Research protocols vary. Often studied alongside zinc supplementation. Typical research doses in the microgram range. |
| Administration | Intramuscular injection. Usually administered in short courses rather than continuously. Often combined with Epithalamin for anti-aging protocols. | Subcutaneous or intramuscular injection in research settings. Requires adequate zinc status for activity. |
| Side Effects | Generally well-tolerated. May cause injection site reactions or temporary flu-like symptoms as immune function is modulated. | Limited data on exogenous administration. Theoretical effects on immune function require monitoring. |
| Best For |
What They Have in Common
Thymalin, Thymulin are both commonly used for:
Which Has Stronger Evidence?
- Immune Support: Thymalin has stronger research support.
| Goal | Thymalin | Thymulin |
|---|---|---|
| Immune Support | high | medium |
| Anti-Aging & Longevity | medium | medium |
Key Studies
Thymalin
- Reparative osteogenesis in mandible in cases of filling a bone defect with hydroxyapatite-containing osteotropic material and injecting the surrounding soft tissues with thymalin: experimental and morphological study.
Wiadomosci lekarskie (Warsaw, Poland : 1960), 2024
- Expression features of T-lymphocytes, B-lymphocytes and macrophages in the post-traumatic regenerate of the mandible rats under conditions of filling a bone defect with hydroxyapatite-containing osteotropic material and thymalin injecting the surrounding soft tissues.
Polski merkuriusz lekarski : organ Polskiego Towarzystwa Lekarskiego, 2024
- The Influence of KE and EW Dipeptides in the Composition of the Thymalin Drug on Gene Expression and Protein Synthesis Involved in the Pathogenesis of COVID-19.
International journal of molecular sciences, 2023
Thymulin
- Thymulin restrains age-associated myeloid inflammation and enhances cancer immunotherapy.
Nature communications, 2026
- Thymulin and peroxiredoxin 6 have protective effects against streptozotocin-induced type 1 diabetes in mice.
International journal of immunopathology and pharmacology, 2021
- Nanoparticle-based thymulin gene therapy therapeutically reverses key pathology of experimental allergic asthma.
Science advances, 2020
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