Nicotinamide riboside chloride (NR-Cl), with the CAS number 23111-00-4, is a chloride salt form of nicotinamide riboside (NR), a vitamin B3 derivative. As an NAD⁺ precursor, NR-Cl plays a critical role in cellular metabolism by enhancing NAD⁺ levels, which activates sirtuins (SIRT1 and SIRT3) and p…