NAD+ restoration
NMN is rapidly converted to NAD+ in cells, restoring levels that decline 40–50% between ages 40 and 60. Higher NAD+ supports mitochondrial efficiency, DNA repair, and metabolic signaling.
Metabolic health
Human trials show NMN supplementation improves insulin sensitivity, reduces liver fat, and improves skeletal muscle insulin signaling — effects mediated through NAD+-dependent SIRT1 activation.
Muscle function and endurance
RCT in older adults showed NMN improved muscle strength, walking speed, and grip strength over 12 weeks, with effects correlating with blood NAD+ increases.
Cognitive support
Preclinical studies show NAD+ restoration improves neuronal function, reduces neuroinflammation, and supports DNA repair in brain cells. Human cognitive trial data is emerging.
NAD+ biosynthesis via salvage pathway
NMN is phosphorylated by NMN adenylyltransferases (NMNATs) to directly produce NAD+. This bypasses rate-limiting steps in other NAD+ precursor pathways, making NMN one of the most efficient NAD+ boosters.
Sirtuin activation
Elevated NAD+ activates sirtuins (SIRT1–7), a family of NAD+-dependent deacetylases that regulate gene expression, mitochondrial biogenesis, inflammation, and stress resistance — key longevity pathways.
PARP-1 support for DNA repair
NAD+ is consumed by PARP-1 during DNA repair. Restoring NAD+ ensures adequate substrate for DNA damage repair, reducing genomic instability associated with aging.
RCT of 250 mg/day NMN vs. placebo in 42 older adults (65+) for 12 weeks.
42 adults aged 65+. 12-week intervention.
NMN significantly increased blood NAD+ metabolites. Improved grip strength, walking speed, and timed chair-stand test vs. placebo. Well-tolerated with no serious adverse events.
First human clinical trial of oral NMN: single doses of 100, 250, and 500 mg in 10 healthy men.
10 healthy men. Single-dose pharmacokinetic study.
All doses safely increased blood NAD+ metabolites within 2–3 hours. No adverse effects on vital signs, metabolic markers, or hormones at any dose. Established safety profile for human use.