PYY 3-36 (Peptide YY, residues 3-36) is a 34-amino-acid gut hormone that acts as a satiety signal through Y2 receptor activation, widely studied in appetite and metabolic research. It is supplied as a high-purity white lyophilized powder, >=99% by HPLC, in sealed vials for laboratory use. PYY 3-36 is investigated in research on appetite suppression, energy intake regulation, gastrointestinal function and neuropeptide Y receptor signaling, and is commonly applied in cell-based assays and preclinical studies. As a research peptide with a defined sequence, it does not have a single unified CAS number. The freeze-dried form ensures high stability and easy reconstitution for reproducible experimental dosing. Strict quality control is maintained on every batch, and COA is available on request. Keep sealed at 2-8 degree C away from light; -20 degree C recommended for long-term storage. Trial and bulk orders welcome with OEM and discreet packing available. For laboratory research use only.