What Is Thymosin Alpha-1?
Thymosin Alpha-1 (TA-1) is a 28-amino acid acidic peptide corresponding to the N-terminal fragment of prothymosin alpha, a protein first isolated from calf thymus tissue in the 1970s during the systematic fractionation work that also produced Thymosin Beta-4. The two share a name because they came out of the same thymic extract, but they are unrelated molecules with entirely different sequences and research profiles: Beta-4 is an actin regulator, while Alpha-1 became the immunology fraction. TA-1 is also notable for how heavily it has been characterized, with decades of published work and a well-established analytical profile, which makes it a reliable reference compound.
The Thymus Connection
The thymus is where T-cells mature, and the thymosin fractions were isolated in the first place because researchers were hunting for the molecules behind that process. The preclinical literature on TA-1 centers on T-cell differentiation and maturation assays, dendritic cell studies, and toll-like receptor signaling models. It is one of the few peptides in this catalog whose primary research domain is the immune axis rather than the GH axis, tissue repair, or metabolism, which gives it a distinct place in study designs.
Research Applications
Published preclinical work spans innate and adaptive immune signaling models, immunosenescence studies examining how immune function changes with age, and cell-culture work on lymphocyte populations. The immunosenescence angle connects it naturally to the cellular-aging compounds in our catalog, and researchers building aging-focused panels often study it alongside Epithalon and NAD+ in our cognitive and longevity category.
Quality Verification
Every compound we stock is tested per product by an independent analytical laboratory, with identity confirmed by mass spectrometry and purity assessed by HPLC. TA-1's acidic 28-residue sequence gives it a distinctive analytical signature that makes identity confirmation unambiguous. Certificates of Analysis are published openly in our testing data library with vial lookup through the COA portal.
Handling and Storage
Thymosin Alpha-1 is supplied as a lyophilized powder in sealed vials. Store lyophilized vials refrigerated, protected from light and humidity. Once reconstituted with bacteriostatic water for laboratory use, keep solutions refrigerated and avoid repeated temperature cycling.
Reconstitution math
Work out concentration (mg/mL), amount per volume and molarity for any vial size with the general peptide calculator. For the bench procedure see how to reconstitute peptides.
Research Use Only
This product is sold for laboratory research use only. It is not for human or veterinary use, not a drug, food, or cosmetic, and may not be used in diagnostics or therapeutics. By purchasing, the buyer confirms they are a qualified researcher and accepts our terms of sale.
