NAD+ (Nicotinamide Adenine Dinucleotide) is an essential coenzyme found in every cell, critical for mitochondrial energy production, DNA repair, and cellular metabolism. Levels naturally decline with age, and research explores NAD+ for its role in boosting energy, supporting cognitive function, promoting healthy aging, and enhancing metabolic health. It is studied for potential benefits in cardiovascular support, reduced oxidative stress, and improved vitality—popular in longevity and cellular regeneration research.