Thymalin is a natural biologically active polypeptide mixture isolated from calf thymus tissue, widely studied in immunology and immune-regulation research. It is supplied as a high-purity white lyophilized powder, >=99% by HPLC, in sealed vials for laboratory use. Thymalin is investigated for its regulatory effects on immune cell development and immune balance, and researchers use it to explore the biological functions of thymic peptides and related immunological mechanisms. As a tissue-derived polypeptide mixture, it does not have a single unified CAS number for all batches. The lyophilized format provides good stability and reproducible reconstitution for consistent dosing. Strict batch quality control is maintained and COA can be provided on request. For storage keep the sealed vial at 2-8 degree C away from light and moisture; -20 degree C is recommended for long-term storage. Trial and bulk orders are welcome with OEM and discreet neutral packing available. For laboratory research use only.