NAD+, NMN, and NR: The Science of Cellular Energy and Aging in 2026
NAD+ declines 50% between age 20 and 50. Sirtuins, DNA repair, and mitochondrial function all depend on it. NMN and NR supplements promise to restore it—but do the human trials justify the cost? Here's an honest evidence review of the most hyped longevity supplement category.