Melatonin is an indoleamine hormone synthesized by the pineal gland that entrains circadian rhythms and acts as a direct free-radical scavenger, supporting research in chronobiology, sleep science and oxidative biology. Its dual receptor-mediated and antioxidant actions make it a versatile research compound. The product is supplied as a white lyophilized powder at >=99% HPLC purity in a sealed vial. Complete documentation and flexible ordering are provided. Independent HPLC verification data can be provided for critical projects, and our quality team responds to specification inquiries with batch-specific details. Orders are consolidated carefully to protect product integrity, and express couriers are used for time-sensitive research deliveries. Temperature-controlled transport is available for sensitive compounds.