Calcitonin is a 32-amino-acid polypeptide hormone produced by thyroid C cells that lowers blood calcium by inhibiting osteoclast activity and promoting calcium excretion, making it central to bone-metabolism research. It is supplied as a high-purity white lyophilized powder at >=99% HPLC purity in sealed vials, offering good stability and simple reconstitution. It is used in osteoporosis studies, calcium-homeostasis experiments, receptor-binding assays on calcitonin receptors and cell-based research on bone and kidney physiology. 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.