Peptide data sheet
Thymosin Alpha-1
Longevity · Tα1 · TA1 · Thymalfasin
Verdict
promisingfor immune-modulation research; human evidence is strongest outside the US and thin for wellness use
Quick answer
Thymosin Alpha-1 is a 28-amino-acid peptide fragment the thymus produces naturally. It is commonly researched for how it modulates immune signalling, and it has been studied in humans for immune support alongside certain therapies in some countries. Sold in the US as a research chemical, it is not FDA-approved, and its effects in healthy people are still being studied.
- Class
- Synthetic thymic peptide fragment (28 amino acids)
- Half-life
- Roughly 2 hours (short-acting)
- FDA status
- Not FDA-approved; sold in the US for research use only
- WADA banned?
- No
Which form actually works?
Injectable (subcutaneous, research)
Promising
The injectable route is the one nearly all human research has looked at, which is why it carries the most data. It is also the form most people report using and asking about in communities.
Oral / capsule
Unproven
Peptides this size are generally broken down in the gut, so oral versions are widely considered poorly absorbed. There is little research support for oral Thymosin Alpha-1, and we treat those claims with caution.