Abstract 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 age-related NAD+ decline, improving mitochondrial function, reducing inflammation, and extending lifespan. However, human clinical trials […]