Melatonin is a naturally occurring indoleamine hormone that regulates circadian rhythm, widely used in biological and sleep research. It is supplied as a high-purity powder in sealed vials for laboratory use. Melatonin is investigated in research on circadian regulation, antioxidant activity and neuroendocrine signaling, and is commonly applied in cell-based and preclinical studies. The lyophilized form provides high stability and easy reconstitution for consistent experimental dosing. Strict quality control is maintained across batches.. 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.