Thymosin Alpha-1, single vial

Thymic peptide, Toll-like receptor signalling modulator

Thymosin Alpha-1

Thymic peptide, Toll-like receptor signalling modulator. Supplied for laboratory research use only.

  • Thymic peptide; approved as Zadaxin in 35+ countries, never FDA
  • Largest trial in this catalogue: TESTS, n=1,106, BMJ 2025
  • Primary endpoint null: 23.4% vs 24.1% mortality, sepsis
  • Supplied for laboratory research use only. Not for human or veterinary use.
$239.99$359.97 Save 33%
Every vial 10 mg
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Research use only. Not for human or veterinary use or consumption. This product is not approved by the FDA and is not intended to diagnose, treat, cure or prevent any disease.

What it is
CompoundThymosin Alpha-1, also designated Thymalfasin
ClassThymic peptide, Toll-like receptor signalling modulator
FormLyophilised powder, supplied in a vial
OriginatorSciClone Pharmaceuticals
Development status

Thymosin Alpha-1 is not approved by the FDA for any indication.

Development status is stated above. No efficacy claim is made on this page.

Shipping & returns
ReturnsNinety days from delivery. Contact us and we will refund the purchase price.
Thymosin Alpha-1 $239.99

The specifics

The details, if you want them.

DeveloperSciClone Pharmaceuticals
Also known asThymalfasin, Zadaxin (brand name in approved markets)
ClassThymic peptide, Toll-like receptor signaling modulator
Amino acids28
Regulatory historyApproved as Zadaxin in 35+ countries; not FDA-approved in the US
FormLyophilised powder (RUO); the approved Zadaxin product is an injectable solution
Receptor target(s)Toll-like receptors (proposed immune signaling role)

Development

Where it is up to.

Peer-reviewed data, including pivotal randomized trials, underlies its approval as Zadaxin outside the US. No FDA/EMA/MHRA/TGA approval exists.

Questions

The questions people actually ask.

What is thymosin alpha-1?
A synthetic 28-amino-acid thymic peptide, developed by SciClone Pharmaceuticals.
Is this the same as Zadaxin?
Thymosin alpha-1 is approved as Zadaxin in 35+ countries, but not by the FDA. This vial is a separate, unbranded research product, not that approved medicine.
What does "Research Use Only" mean?
Research Use Only means exactly that: intended for laboratory and research settings only, not for human or animal use, consumption, diagnosis, treatment, cure, or prevention of any disease.
How is thymosin alpha-1 supplied?
As a vial of lyophilised (freeze-dried) powder, sold for laboratory and research use only.
What is your refund policy?
Ninety days from delivery. If you decide against it inside that window, contact hello@getmrpeps.com and we will refund the purchase price. Damaged or incorrect orders are replaced or refunded regardless.