NAD+ (Nicotinamide Adenine Dinucleotide) is a critical coenzyme found in all living cells that plays a central role in cellular metabolism and energy production. NAD+ functions as an electron carrier in redox reactions, shuttling electrons between metabolic pathways, and serves as an essential cofactor for various enzymes including sirtuins, poly(ADP-ribose) polymerases (PARPs), and CD38. Beyond its metabolic functions, NAD+ participates in signaling pathways involved in DNA repair, gene expression regulation, stress responses, and calcium signaling. NAD+ levels naturally decline with age, making it a key molecule of interest in longevity research and age-related conditions.
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