NR-CL (Nicotinamide Riboside Chloride) is a stable, chloride salt form of nicotinamide riboside, a precursor to the essential coenzyme NAD+ (Nicotinamide Adenine Dinucleotide).NR-CL is efficiently absorbed and converted into NAD+ within the body, thereby supporting cellular energy production, DNA repair, and sirtuin-mediated anti-aging pathways.