HomePeptides › Thymosin Alpha-1

Thymosin Alpha-1

Zadaxin, Talpha1

Tier 3 · Limited Human Data
Class
Immunomodulatory peptide
Molecular target
TLR2 / TLR9 signalling; T-cell maturation
Sequence / structure
28-aa N-terminally acetylated peptide
Evidence tier
Tier 3 — Limited Human Data
Category
Immune & Thymic

Biology & mechanism

A naturally occurring thymic peptide that promotes T-cell maturation and dendritic cell function, acting substantially through Toll-like receptor signalling. It shifts immune responses toward Th1 and augments antigen presentation. Unlike most peptides in this library, its mechanism is comparatively well characterised.

What the research actually shows

Studied in chronic hepatitis B and C, as a vaccine adjuvant, in sepsis, and in cancer immunotherapy contexts. Trial results are mixed but the human evidence base is real and substantially larger than for the grey-market peptides.

Regulatory status

Not FDA-approved. Approved and marketed in roughly 30 other countries (as Zadaxin) for hepatitis B and C and as a vaccine adjuvant. Was subject to FDA 503A bulk substance review.

Safety signals

Generally well tolerated in trials. Immunostimulation carries theoretical concerns in autoimmune disease and transplant recipients.

No usage guidance is published here

Forge Bioenergy does not publish dosing, reconstitution, or administration protocols for any peptide. See our editorial policy for why. If you are considering any substance on this page, that conversation belongs with a licensed physician.

References & further reading

Regulatory status changes. This page reflects our reading of public sources as of July 2026 and should be independently verified before it is relied upon.

Important notice Forge Bioenergy publishes scientific reference information only. Nothing on this site is medical advice, a therapeutic claim, or a recommendation to use any substance in humans. Many peptides described here are not approved by the FDA for any use, and several are approved only for narrow indications under prescription. We do not publish dosing, administration, or usage protocols. Consult a licensed physician before making any medical decision.