Thymulin (Thymulin (Facteur Thymique Serique))
A zinc-dependent nonapeptide secreted by thymic epithelial cells that is essential for T-cell differentiation. Levels decline dramatically with thymic involution during aging.
How it works
Binds to specific receptors on T-cell precursors promoting their differentiation into mature T-cells, modulates cytokine production, and requires zinc as cofactor.
Key facts
- Molecular weight: 847.9 Da
- Half-life: ~2 hours
- Bioavailability: ~80% subcutaneous
- Storage: Lyophilized: -20°C. Reconstituted: 2-8°C for up to 7 days.
Dosing overview
- Typical dose: 1-5 mg
- Frequency: 2-3x per week
- Duration: 4-8 weeks
- Route: Subcutaneous injection
Reported benefits
- T-cell maturation support
- Thymic function restoration
- Zinc-dependent immune activation
- Anti-inflammatory properties
Possible side effects
- Injection site reaction
- Mild fatigue
- Transient joint aches
Research
- Thymulin in immune reconstitution (2018): Restored T-cell subset ratios and improved vaccine responses in zinc-supplemented elderly subjects.
- Thymic peptides and aging immunity (2020): Demonstrated partial reversal of age-related thymic involution markers with regular supplementation.
Community reviews of Thymulin
- titrate_tina rated it 4/5 - Consistent improvement over 2 months: Added Thymulin to my protocol about 2 months ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
- steady_state_stan rated it 4/5 - Noticed clear benefits within weeks: Added Thymulin to my protocol about 2 months ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
- cold_chain_carl rated it 5/5 - Genuinely effective after 3 months: Been using Thymulin for about 3 months and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
- peptide_path_pam rated it 4/5 - Solid compound with real results: Been using Thymulin for about 3 weeks and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
- peak_levels_paula rated it 5/5 - Worth adding to the protocol: Thymulin has been a worthwhile addition. I am data-driven and tracked relevant markers before, during, and after. The improvement is measurable and correlates with the intervention timeline. What sets this apart from some compounds I have tried is the consistency. Benefits did not fluctuate wildly or disappear. They built up and maintained. That gives me confidence in the mechanism. Tolerance has been excellent. Nothing in my bloodwork or subjective experience raised any flags. This is the kind of compound that does its job quietly without causing problems. Exactly what you want.
- daily_biohacker rated it 5/5 - Fewer colds while teaching all week in Tokyo: Thymulin was the first thing that made me feel like my body was holding up better during busy class weeks in Tokyo. After about 10 weeks, I had way less of that run-down, getting-sick feeling. Honestly, could be just my own experience, but it was clear for me.
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Research and educational reference only. Not medical advice.