The science
No hype, no borrowed jargon. Here is the biology behind the molecule, the pathways that depend on it, what the human evidence currently supports — and what it does not.
The basics
Nicotinamide adenine dinucleotide (NAD+) is a coenzyme present in every living cell. It shuttles electrons during glycolysis, the citric acid cycle and oxidative phosphorylation — the three steps that convert food into ATP, the currency your cells spend.
Tissue measurements across skin, liver, muscle and brain suggest NAD+ availability falls substantially between early adulthood and later life. Chronic inflammation and higher activity of the NAD+-consuming enzyme CD38 are both implicated in that decline.
Unlike a catalyst that is recycled indefinitely, NAD+ is cleaved and consumed by sirtuins, PARPs and CD38. Cells rebuild it continuously through the salvage pathway, which recycles nicotinamide back into NAD+ via the enzyme NAMPT.
The pathways
NAD+-dependent deacetylases involved in mitochondrial biogenesis, DNA-repair signalling and metabolic regulation. Without sufficient NAD+ they simply cannot act.
Poly(ADP-ribose) polymerases detect and help repair DNA strand breaks. Repair work is NAD+-expensive, so heavy DNA damage draws down the cellular pool.
An immune-cell enzyme that degrades NAD+ precursors. Its activity rises with age-related inflammation, accelerating the decline.
The main route of resupply in humans: nicotinamide → NMN (via NAMPT) → NAD+ (via NMNAT). This is why precursor and direct-NAD+ strategies differ in how quickly they raise the pool.
The evidence
In preclinical models, restoring NAD+ improved mitochondrial respiration and endurance capacity in aged muscle. Human trials are smaller, but consistently show that circulating NAD+ can be raised by supplementation.
Randomised human studies of NAD+ precursors report improved insulin sensitivity and muscle NAD+ content in some populations, with effect sizes that vary by age and baseline status.
NAD+ is not a treatment for any disease and has not been shown to extend human lifespan. The honest summary is a strong mechanistic rationale, encouraging early human data, and ongoing trials.
This page is general information, not medical advice. NAD+ The One is a supplement and is not intended to diagnose, treat, cure or prevent any disease.
Common questions
