Thymosin Alpha-1 — Research Evidence & Community Data
Also known as: Tα1, Zadaxin, thymalfasin
Research & educational use only. This content is not medical advice. Consult a qualified healthcare professional before using any peptide compound.
What Is Thymosin Alpha-1?
Thymosin alpha-1 is a 28-amino-acid peptide derived from prothymosin alpha that modulates immune function, particularly T-cell maturation. It is approved or registered in several countries (as Zadaxin) for indications such as chronic hepatitis B and as an immune adjuvant, but it is not FDA-approved in the United States. Human clinical data exist for several infectious and immune indications, with mixed and indication-dependent results.
Is Thymosin Alpha-1 FDA Approved?
Thymosin Alpha-1 is investigational. It is treated as a research compound in the United States with no approved human clinical applications.
What Does the Research Show?
As of 2026, there are 6 human randomized controlled trials with a combined 1,500 subjects, and 30 animal model studies. Human trials across hepatitis, sepsis, and vaccine-adjuvant settings show indication-dependent and mixed results. Approved in several countries but not by the FDA.
No linked evidence entries yet.
What Do Community Logs Show?
No community logs include Thymosin Alpha-1 yet. Browse community logs →
How Is Thymosin Alpha-1 Used in Research?
Mechanism of action. Immunomodulation via Toll-like receptor signaling and enhanced T-lymphocyte differentiation and function.
Half-life. Reported plasma half-life around 2 hours.
Storage. Lyophilized: store frozen. Reconstituted: refrigerate 2-8C.
Reconstitution. Reconstituted with bacteriostatic water for research handling. Math only - not dosing guidance. See the reconstitution calculator — a math tool only, not dosing guidance.
What Does Thymosin Alpha-1's Evidence Tier Mean?
Thymosin Alpha-1 is rated Tier 2 · Observational. Supported by human observational or clinical reports. Evidence tiers are a shorthand for how strong the human data is — Tier 1 reflects human randomized controlled trials, while lower tiers rest on observational, animal, or theoretical evidence. A higher tier means more confidence that observed effects are real and caused by the compound rather than by chance or bias. For how to weigh each tier, see our guide to understanding peptide evidence tiers.
How Do You Evaluate Thymosin Alpha-1 Sourcing and Quality?
Because research-chemical Thymosin Alpha-1 is unregulated, sourcing quality varies widely between sellers. Before trusting any supplier, check its reputation and enforcement history in the ranked list of trusted peptide sellers, and look for a batch-specific certificate of analysis (COA) showing third-party HPLC or LC-MS purity testing. Purity claims without a named lab, a batch number, and a method are marketing, not data. If you are reconstituting lyophilized material, the reconstitution calculator handles the arithmetic — it is a math tool only and not dosing guidance.
Where to Buy Thymosin Alpha-1: Trusted & Verified Sellers
Thymosin Alpha-1 is supplied by specialist research-chemical sellers rather than pharmacies, so where you buy it matters as much as what you buy. The sellers below have published moderator-approved third-party lab results for Thymosin Alpha-1, ranked by overall reputation score. Always confirm a current batch-specific COA before purchasing.
No seller has published a lab result for Thymosin Alpha-1 yet. Browse the ranked directory of trusted peptide sellers and check each one's lab testing and enforcement record before buying.
PeptidesHub does not sell Thymosin Alpha-1 or facilitate transactions — this list is for research transparency only.
How Are Adverse Reactions to Thymosin Alpha-1 Reported?
Structured adverse-event reports help the whole community spot safety signals early. You can browse approved reports on the adverse events page or submit one yourself. For a serious or life-threatening reaction, seek medical care and report it to FDA MedWatch.
Frequently Asked Questions
Thymosin Alpha-1 is investigational. It is treated as a research compound in the United States.