Nicotinamide riboside (NR) is a form of vitamin B3 that plays a crucial role in cellular metabolism. It is a precursor to NAD+, a coenzyme essential for energy production and various biological processes. NR is found in small amounts in certain foods, such as milk and yeast, and is also available as a dietary supplement. Research suggests that nicotinamide riboside may help improve metabolic health, enhance physical performance, and support healthy aging. By increasing NAD+ levels, NR may promote cellular repair and resilience, potentially benefiting overall health and longevity.