Yes. Every batch is third-party tested by an ISO/IEC 17025-accredited laboratory for identity, NMN purity, heavy metals, and microbial safety. ?-NMN (the bioactive beta isomer) is verified by HPLC against reference standards — the industry-standard method for distinguishing ?-NMN from degradation products and the alpha isomer. The full COA panel also covers four heavy metals via ICP-MS (arsenic, cadmium, lead, mercury against USP <2232> limits) and six microbial screens (Total Plate Count, Yeast & Mold, Coliform, E. coli, Salmonella, Staphylococcus aureus per USP <2021>/<2022> and AOAC methods). Manufactured in a cGMP-certified U.S. facility.