Insulin is a peptide hormone that regulates glucose metabolism, widely used in cell-culture and metabolic research. It is supplied in sealed vials as a research-grade preparation for qualified laboratory use. Insulin is investigated in research on glucose uptake, insulin-receptor signaling and cellular metabolism, and is commonly applied in cell-based assays and endocrine studies. The stable preparation supports convenient dosing and consistent results in experimental protocols. Every batch is quality-controlled.. Each production batch is tested for purity and batch COA is issued upon request. Store the sealed vial at 2-8 degree C, protected from light and humidity; for extended storage -20 degree C is recommended with limited freeze-thaw cycles. Trial orders and bulk supply are both accepted, with OEM and private-label service and discreet neutral packing for worldwide shipping. Research use only, not for human or veterinary application.