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Nicotinamide adenine dinucleotide (NAD) is crucial for regulating energy production and DNA repair. Higher NAD levels are generally beneficial, but they decline with age. Supplementing with NAD precursors like nicotinamide mononucleotide (NMN) and nicotinamide riboside (NR) has shown promising results in boosting NAD levels, supporting cellular health, and potentially slowing aging. 

 Source: Lifespan News