NAD+

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme essential for mitochondrial energy production, DNA repair, and activation of sirtuins — longevity-regulating proteins. NAD+ declines approximately 50% between ages 20 and 60, making its maintenance a primary target of longevity research.

NAD+ is one of the most abundant molecules in the body and participates in hundreds of metabolic reactions. In its oxidized form (NAD+), it accepts electrons during cellular respiration, allowing mitochondria to generate ATP. In its reduced form (NADH), it donates electrons to the electron transport chain. The NAD+/NADH ratio is a key indicator of cellular metabolic state.

Beyond energy metabolism, NAD+ is consumed as a substrate by two critical enzyme classes: PARP enzymes (which repair DNA damage) and sirtuins (which regulate gene expression, mitochondrial function, and stress resistance). Both processes compete for the same NAD+ pool — high DNA damage loads deplete NAD+ at the expense of sirtuin activity, potentially explaining the link between DNA damage accumulation and loss of longevity regulation in aging.

NAD+ levels decline with age due to increased consumption (rising DNA damage, inflammation) and potentially reduced synthesis. The dietary precursor niacin (vitamin B3) and tryptophan feed into NAD+ biosynthesis through established pathways. Supporting NAD+ through lifestyle is the most accessible strategy.

Exercise — particularly intense aerobic exercise — is a potent natural NAD+ booster via AMPK activation and increased cellular energetic demand. Time-restricted eating also elevates NAD+ through similar pathways. Apigenin (found in parsley and chamomile) inhibits CD38, an enzyme that consumes NAD+, and may help preserve cellular NAD+ pools with age.

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