Nicotinamide Riboside and NAD+ Decline: Hype vs. Evidence

Nicotinamide riboside (NR), a precursor to Nicotinamide Adenine Dinucleotide (NAD+), has emerged as a popular anti-aging supplement due to its role in cellular energy metabolism and sirtuin activation.Preclinical studies in model organisms demonstrate that NR supplementation can counteract agerelated NAD+ decline, improving mitochondrial function, reducing inflammation and extending lifespan.However, human clinical trials reveal only modest benefits-such as enhanced muscle endurance and mild cardiometabolic improvements-with limitations including short study durations, small sample sizes and potential industry bias.While NR appears safe at doses up to 2,000mg/day, concerns persist about its long-term effects and overstated commercial claims.This review critically evaluates the translational gap between animal data and human outcomes, emphasizing the need for rigorous, independent research to validate NR's anti-aging potential.