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Nicotinamide adenine dinucleotide (NAD
) is a coenzyme for redox reactions, making it central to energy metabolism. NAD
is also an essential cofactor for non-redox NAD
-dependent enzymes, including sirtuins, CD38 and poly(ADP-ribose) polymerases. NAD
can directly and indirectly influence many key cellular functions, including metabolic pathways, DNA repair, chromatin remodelling, cellular senescence and immune cell function. These cellular processes and functions are critical for maintaining tissue and metabolic homeostasis and for healthy ageing. Remarkably, ageing is accompanied by a gradual decline in tissue and cellular NAD
levels in multiple model organisms, including rodents and humans. This decline in NAD
levels is linked causally to numerous ageing-associated diseases, including cognitive decline, cancer, metabolic disease, sarcopenia and frailty. Many of these ageing-associated diseases can be slowed down and even reversed by restoring NAD
levels. Therefore, targeting NAD
metabolism has emerged as a potential therapeutic approach to ameliorate ageing-related disease, and extend the human healthspan and lifespan. However, much remains to be learnt about how NAD
influences human health and ageing biology. This includes a deeper understanding of the molecular mechanisms that regulate NAD
levels, how to effectively restore NAD
levels during ageing, whether doing so is safe and whether NAD
repletion will have beneficial effects in ageing humans.