Thymosin Alpha-1 Research Peptide
Thymosin Alpha-1 is a chain of 28 amino acids, first found in the thymus.
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Research Use Only · Not for human or veterinary consumption.
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In the 16-section GHS format covering identification, hazards, handling, storage and disposal.
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What is Thymosin Alpha-1?
Thymosin Alpha-1 is a chain of 28 amino acids, first found in the thymus. That is the small gland behind the breastbone where immune cells learn to tell friend from foe. The compound carries a chemical cap at one end called an acetyl group. That cap is part of what it is: without it the chain weighs 42 units less and is a different substance. It is not Thymosin Beta-4, which is sold separately here and shares part of a name and little else.
Product information reviewed by Dr. Martina Rossi, PhD
Scientific Contributor and Reviewer · Reviewed
Thymosin Alpha-1 Research & Reference
What Thymosin Alpha-1 does in published studies, and how to work with it in the laboratory, are covered in full on two dedicated pages rather than summarised here, so neither the evidence nor the handling detail is cut short.
Technical Specs
Labeled quantity is net peptide content, not gross salt weight.
Frequently Asked Questions
Is Thymosin Alpha-1 third-party tested for purity?+−
Yes. Every batch of Thymosin Alpha-1 is tested by an independent third-party laboratory using HPLC and MS-UPLC, confirming purity and mass identity before the batch is released. Pure Peptides does not test its own material.
What does "Research Use Only" mean?+−
It means Thymosin Alpha-1 is supplied for in-vitro laboratory research and for no other purpose, and must not be administered to humans or animals. Thymosin Alpha-1 is legal to purchase in the United States for in vitro and non-clinical laboratory research. Thymosin Alpha-1 is not a scheduled substance under the Controlled Substances Act. As a medicine it is known as thymalfasin and marketed under the brand name ZADAXIN; it is authorised in more than 30 countries outside the United States and Europe, according to its developers, and it holds no marketing authorisation from the FDA, the UK MHRA, or, beyond a single orphan drug designation, the European Medicines Agency. The material supplied here is a research-grade preparation, not that licensed medicine, and it holds no marketing authorisation. Sold strictly for qualified research use, not human or veterinary administration.
How is Thymosin Alpha-1 shipped and stored?+−
Thymosin Alpha-1 ships from US stock with cold-chain packaging and full tracking; orders placed before noon EST on business days are typically dispatched the same business day. On arrival, store the lyophilized powder at -20°C or below, dry and protected from light.
Is this the same as Thymosin Beta-4 or TB-500?+−
No. Thymosin Alpha-1 is a 28-amino-acid peptide with an acetylated N-terminus. Thymosin Beta-4 is a separate 43-amino-acid peptide, and TB-500 is a fragment associated with it. They share a family name and nothing else. Research findings for one say nothing about the others.
What do the clinical trials show?+−
They disagree. A 2025 double-blind phase 3 trial randomized 1,106 patients and analyzed 1,089, finding 28-day mortality of 23.4% against 24.1% on placebo, with no difference on any secondary or safety outcome. A 2013 single-blind trial in 361 patients found 26.0% against 35.0%, at marginal significance that changes with the statistical test applied. A 2025 meta-analysis of 11 trials found a significant pooled effect that was no longer significant when restricted to high-quality or multicentre trials. The Thymosin Alpha-1 research article reports all three.
Compare Thymosin Alpha-1
Side-by-side pages that tell Thymosin Alpha-1 apart from other compounds: how the two relate, which molecule the published evidence used, and whether they have been compared directly.
Immune & Thymic Research
Related Compounds
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Background and context on this compound.
Reviewed for scientific accuracy
Dr. Martina Rossi, PhD
PhD, Université Grenoble Alpes · Scientific Contributor and Reviewer
Dr. Rossi's doctoral research at Université Grenoble Alpes examined the vascular functions of bone morphogenetic proteins. Her peer-reviewed work spans cell and molecular biology, vascular biology, and gene therapy, in journals including Cardiovascular Research, Scientific Reports, and Brain Sciences. She reviews Pure Peptides' product, reference, and research pages for scientific accuracy against the sources they cite.