What Is NAD+?
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in all living cells. It is essential for cellular metabolism, serving as an electron carrier in oxidative phosphorylation (the process cells use to produce ATP energy). Beyond energy production, NAD+ is a critical substrate for a class of proteins called sirtuins and for PARP enzymes involved in DNA repair.
NAD+ levels decline with age — approximately 50% from young adulthood to age 60 in most tissues. This decline is now a central hypothesis in the biology of aging, and NAD+ replenishment research is one of the most active areas in longevity science.
Why NAD+ Searches Are Surging
The +601% growth in NAD+ co-searches with "peptide therapy" reflects a convergence: people already researching injectable peptides are extending their interest to the broader longevity and cellular health stack. NAD+ fits this profile perfectly — it has a deep publication history, well-understood mechanisms, and an accessible research base that doesn't require deep biochemistry background to evaluate.
Researchers like David Sinclair (Harvard) have brought NAD+ precursor research (NMN, NR) into mainstream awareness. This has created a large audience looking for direct NAD+ research alongside the precursor supplement category.
Mechanisms of Action
Sirtuin Activation
Sirtuins are a family of seven enzymes (SIRT1–SIRT7) that regulate gene expression, DNA repair, and metabolism. They require NAD+ as a co-substrate to function. As NAD+ declines with age, sirtuin activity decreases — leading to reduced DNA repair, increased inflammation, and metabolic dysfunction. NAD+ replenishment in animal models restores sirtuin activity and partially reverses these age-associated changes.
PARP-1 & DNA Repair
PARP-1 (poly-ADP-ribose polymerase 1) is a primary DNA damage sensor that consumes NAD+ to repair strand breaks. Chronic low-grade DNA damage — which accumulates with age — continuously activates PARP-1, depleting NAD+ stores. This creates a feedback loop: aging causes DNA damage → PARP-1 consumes NAD+ → lower NAD+ reduces sirtuin function → more cellular aging. Research on breaking this cycle is a major focus of longevity science.
Mitochondrial Function
NAD+ is required for the citric acid cycle and the electron transport chain — the two core processes of mitochondrial ATP production. Declining NAD+ levels impair mitochondrial efficiency, reducing cellular energy production and increasing oxidative stress. Studies in aged animals show that NAD+ replenishment improves mitochondrial biogenesis and function.
CD38 & NAD+ Consumption
CD38 is an enzyme that increases in activity with age and is one of the primary consumers of NAD+ in older tissues. Research on CD38 inhibitors as a strategy to preserve NAD+ levels is an emerging parallel track in longevity research.
NAD+ in the Context of Peptide Research
Researchers interested in peptide protocols increasingly incorporate NAD+ as a complementary compound. The mechanistic logic: peptide compounds like BPC-157, GHK-Cu, and TB-500 address tissue-level repair and signaling, while NAD+ addresses cellular energy substrate and DNA repair — operating at a different level of the biological hierarchy.
Several peptides in the Evo catalog work through pathways that benefit from adequate NAD+ levels, including mitochondrial peptides (MOTS-c) and tissue repair compounds that rely on energy-intensive cellular remodeling processes.
Research Forms & Specifications
| Property | Value |
|---|---|
| Full name | Nicotinamide adenine dinucleotide (oxidized form) |
| Molecular weight | 663.43 Da |
| Appearance | White to off-white powder |
| Solubility | Water soluble |
| Storage (lyophilized) | −20°C (long-term); 2–8°C (short-term, weeks) |
| pH sensitivity | Degrades in acidic conditions; store in neutral/slightly basic solutions |