NAD+ is a critical coenzyme for cellular energy (ATP) and activates SIRT1 "longevity proteins" for DNA repair and inflammation regulation. NAD+ declines 1–2% annually after 30, reaching half by 50. The 2026 Chinese Medical Association consensus links NAD+ decline to metabolic, cardiovascular, and neurodegenerative diseases. Resveratrol—a natural polyphenol—activates SIRT1, enhancing NAD+'s "engine ignition." Together, NAD+ provides fuel, resveratrol improves engine sensitivity. Natural foods contain only trace NAD+ precursors (micrograms in milk)—insufficient to bridge the age‑related gap. Optimal starting window: 40–50, when compensation mechanisms still function but the repair‑metabolism gap widens. Consensus: no universal answer—individualized scientific judgment remains key.
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