NAD+ Research Guide: Cellular Energy, Sirtuins
NAD+ sits at the center of cellular energy metabolism and sirtuin signaling. Here is what the research literature actually shows.
What is NAD+?
NAD+ is a pyridine nucleotide coenzyme present in every living cell. It exists in two interconverting forms — NAD+ (oxidized) and NADH (reduced) — that drive electron transfer in glycolysis, the citric acid cycle, and oxidative phosphorylation.
Beyond energy metabolism, NAD+ is consumed by sirtuins (SIRT1–SIRT7), poly-ADP-ribose polymerases (PARPs), and CD38, connecting NAD+ availability to DNA repair, mitochondrial biogenesis, inflammatory tone, and circadian regulation.
Mechanism of action — sirtuin and PARP pathways
Sirtuins are NAD+-dependent deacylases that regulate transcription factors, metabolic enzymes, and chromatin. SIRT1 and SIRT3 are widely studied in models of metabolic stress and mitochondrial function.
PARPs consume NAD+ during DNA damage response. Chronic genotoxic stress can deplete cellular NAD+ through PARP hyperactivation, linking NAD+ availability to genomic stability research.
Why NAD+ declines with age
Published tissue analyses across rodents and humans show progressive NAD+ decline driven by reduced biosynthesis (NAMPT), increased consumption (CD38 upregulation, chronic inflammation), and PARP activation from accumulated DNA damage.
Sourcing & purity
Research-grade NAD+ should be ≥99% pure by HPLC. Redline Bio NAD+ ships with batch documentation; independent COAs are published on the lab reports page as third-party testing completes.
Compliance reminder
NAD+ is sold for laboratory research use only. Not for human consumption, diagnosis, treatment, or cure of any disease. Researchers are responsible for compliance with all applicable regulations.
Frequently asked questions
What is NAD+?
NAD+ (nicotinamide adenine dinucleotide, oxidized form) is a coenzyme essential for redox reactions in cellular energy production and a substrate for sirtuins, PARPs, and CD38 — enzymes involved in DNA repair, gene expression, and aging biology.
Why is NAD+ studied in aging research?
Tissue NAD+ levels decline measurably with age across rodent and human studies. Restoring NAD+ in animal models has been shown to improve mitochondrial function, sirtuin signaling, and several markers of cellular aging.