Endothelin-1 is a 21-amino-acid vasoactive peptide that is among the most potent endogenous vasoconstrictors, studied in cardiovascular research. It is supplied as a high-purity white lyophilized powder at >=99% HPLC purity in sealed vials. Endothelin-1 is investigated in research on vascular tone and endothelin-receptor signaling, and is commonly applied in cell-based and preclinical studies. The lyophilized format ensures stable reconstitution and consistent dosing. Quality control is performed on each batch with batch COA available on request. Keep the product sealed at 2-8 degree C, protected from light and moisture; for long-term storage -20 degree C is recommended and repeated thawing should be avoided. We accept both sample and bulk orders, offer OEM and private label service, and arrange discreet neutral packing for worldwide shipping. Intended for laboratory research only, not for human or veterinary application.