NAD+ Supplements

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every cell in the body, where it plays a central role in turning food into usable energy. Levels are known to decline with age, which is why NAD+ supplements exist — they typically contain NAD+ itself, or precursor ingredients like nicotinamide riboside that the body converts into NAD+. 

NAD+ is involved in energy production, cell repair and a number of other processes that naturally slow down as levels decline with age, which is why the ingredient has become a focus of longevity research. That said, most of this research is still early-stage, and the science on whether supplementing NAD+ meaningfully affects those processes in humans is still developing. It's worth going in with realistic expectations and, if you have any health conditions or take medication, checking with a healthcare professional first.