Thymulin quick reference
What is Thymulin?
Natural thymus hormone that only works bound to zinc.
Some use it for immune support and thymus aging.
No human treatment trial; vial identity and zinc content vary.
How Thymulin works
Zinc binding makes the peptide active.
Helps T cells mature; activity fell with mild zinc deficiency in people.
Lowered inflammatory signals in aged mice.
Very low doses raised pain sensitivity; higher doses eased inflammatory pain.
What Thymulin is studied for
Thymulin activity fell with mild zinc loss and recovered with zinc.
Lowered myeloid inflammation and improved tumour control.
Higher doses reduced endotoxin-induced pain in rats.
A thymulin-analog gene helped hormone problems in athymic mice.
Promoted T-cell differentiation in lab studies.
Thymulin dosing protocol
| Item | What is known |
|---|---|
| Human dose | Not established |
| Studied in | Lab and animal studies; reviews of the natural hormone |
| Human trials | None found for thymulin as a treatment |
A ClinicalTrials.gov search for thymulin returned only a zinc-supplement trial in infants (NCT01229579), not a thymulin trial. Reviews: Bach 1989, Goya 2004, Dardenne 2006.
Label and trial amounts come from the sources below. Community amounts are what people report; they have not been tested.
Mixing
A vial label does not prove the zinc-bound form.
What the research found
No human treatment results exist.
Searches of ClinicalTrials.gov and PubMed on 5 Nov 2026. Reviews describe the natural hormone and animal work only.
Thymulin community experience
What users report. Not tested in trials.
Positive reports
- Immune interest Most talk is about T-cell and thymus support.
- Healthy-aging talk Thymus decline with age drives the interest.
- Hair talk Zinc-thymulin for hair draws separate interest.
Negative & mixed
- Name mix-ups Often confused with Thymalin and other thymic peptides.
- Product differences Zinc-bound and plain peptide may act differently.
- Hard to attribute Illness, zinc status and other peptides blur results.
Thymulin stacking
Both immune peptides. Not studied together.
Two thymic peptides. Not studied together.
Overlap in hair and skin interest only. Not studied.
Thymulin side effects & safety
Common
- No human safety data for injected thymulin.
- Injected products may cause redness, pain or irritation.
- Topical tolerability findings do not apply to injections.
- No reliable interaction data with immune drugs.
Less common
- Allergy to the peptide or vial ingredients.
- Very low doses raised pain sensitivity in rats.
- Zinc content and purity can vary by product.
Precautions
- Avoid in pregnancy, breastfeeding or under 18.
- Autoimmune disease, transplant or active cancer: ask a doctor first.
- Immunosuppressants may clash with immune peptides.
- Extra zinc can upset copper balance; do not add it blindly.
Our verdict on Thymulin
Solid physiology, but no treatment trials. Do not borrow doses from other thymic peptides.
Thymulin FAQ
Why does thymulin need zinc?
Zinc binds the peptide and makes it active.
Is thymulin the same as Thymalin?
No. Thymalin is a calf-thymus mix; thymulin is one 9-amino-acid peptide.
Has thymulin been tested in people?
Only as a natural hormone in zinc studies. No treatment trials found.
Sources
- Bach JF. Med Oncol Tumor Pharmacother 1989 (Thymulin, a zinc-dependent hormone), PMID 2657247
- Goya RG et al. Peptides 2004 (Thymulin and the neuroendocrine system), PMID 15003367
- Dardenne M et al. Ann N Y Acad Sci 2006 (thymulin or its analogue as an analgesic), PMID 17192563
- ClinicalTrials.gov search for thymulin: only NCT01229579 (zinc in infants)
- Drugs@FDA / openFDA search: no thymulin product
- Prasad AS et al. J Clin Invest 1988 (serum thymulin in human zinc deficiency), PMID 3262625
- Kanemaru H et al. Nat Commun 2026 (thymulin and aged-mouse inflammation), PMID 42481458
- Reggiani PC et al. Curr Pharm Des 2014 (thymulin physiology and gene therapy), PMID 24588820