NAD+

NAD+ (Nicotinamide Adenine Dinucleotide) is a coenzyme found in every living cell, essential for cellular energy metabolism and over 500 enzymatic reactions. Research has established its critical role in mitochondrial function, DNA repair (via PARP enzymes), circadian rhythm regulation, and sirtuin activation. NAD+ levels decline with age, and restoration of NAD+ has become a central focus of longevity and aging research.