NAD+ Cell Regenerator / Life Extension NIAGEN / Nicotinamide Riboside 100 mg NAD+ Cell Regenerator™ 100 mg, 30 vegetarian capsules Item Catalog Number: 01904 If you are experiencing fatigue and lack of motivation, it may be due to the age-related decline in NAD+ levels1 and subsequent impairment of healthy cellular metabolism.2 NAD+ (nicotinamide adenine dinucleotide) promot..