Immune · Peptide
Thymosin Alpha-1
Also known as Zadaxin
An immune-modulating peptide used in some countries to support immune response.
Status as of 2026-07 · reclassification ≠ FDA approval · educational only, not medical advice.
The signal it sends
Helps mature and direct T-cells, tuning the immune system.
Benefits & effects studied
- Immune support
- Infection & cancer-adjunct research
Research state
Approved in some countries; regulatory status varies widely.
Dosing & pharmacokinetics
Subcutaneous, typically twice weekly (where used). Half-life: ~2 hours.
Dosing information is educational only. Thymosin Alpha-1 decisions belong with a licensed clinician — Jevity does not recommend or supply dosing.
History & discovery
First described 1977 (characterized) by Allan Goldstein and colleagues Origin: Isolated by Allan Goldstein and colleagues from thymosin fraction 5, a crude bovine-thymus extract studied since the 1960s for immune-restoring activity; thymosin alpha-1 was identified as the most active component and fully characterized in 1977, with synthetic production following in the early 1980s..
Molecular structure
A 28-amino-acid peptide originally isolated from thymus extract (thymosin fraction 5).
Frequently asked questions
Is Thymosin Alpha-1 FDA-approved?
Not FDA-approved (approved abroad as Zadaxin®); compoundable (removed Cat 2, Sep 2024) On Jevity's evidence scale, Thymosin Alpha-1 is graded "In human trials". Reclassification for compounding is not the same as FDA approval.
What is Thymosin Alpha-1 used for?
An immune-modulating peptide used in some countries to support immune response. Helps mature and direct T-cells, tuning the immune system. Studied effects include: Immune support; Infection & cancer-adjunct research. This is educational information, not a recommendation to use it.
Is Thymosin Alpha-1 legal in the UAE?
UAE / DHA status: Prescription-only via a DHA-licensed clinic
Is Thymosin Alpha-1 banned in sport?
WADA status: Not prohibited
What is Thymosin Alpha-1's Jevity Score?
Thymosin Alpha-1 has a Jevity Score of 65/100 — a proprietary composite of evidence strength (7/10), regulatory clarity (6/10) and supply verifiability (6/10). It reflects how established and legitimate the compound is, not a recommendation.
Thymosin Alpha-1 is prescription-only or research-only. A licensed clinician must evaluate whether it's appropriate for you.
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Educational information only — not medical advice, a diagnosis, or a recommendation to use any substance or therapy. Regulatory status changes; verify current rules and any personal decision with a licensed clinician. Jevity is operated by Upcapital Global FZCO, Dubai, UAE.