How Does NAD+ Activate Sirtuins and Support DNA Repair?

Sirtuins are a family of enzymes that require NAD+ as a cofactor to function — without sufficient NAD+, sirtuin activity declines regardless of how much of the sirtuin protein itself is present. SIRT1 and SIRT3 specifically are the most studied in longevity-adjacent research, linking cellular NAD+ levels directly to this signaling pathway.

Separately, PARP (Poly ADP-Ribose Polymerase) enzymes consume NAD+ as they work to repair DNA damage — single- and double-strand breaks. This creates a documented tension in aging research: as NAD+ declines with age, both sirtuin activity and DNA-repair capacity are affected simultaneously, since both processes draw from the same NAD+ pool.

This mechanism summary reflects published research literature on NAD+ biology and is provided for research background only — not a therapeutic claim. REVIVE LAB UAE sells NAD+ strictly as a laboratory reference material.