NMN, NAD+ and Sirtuins: state of the research

Why NAD+?

NAD+ (nicotinamide adenine dinucleotide) is a central coenzyme in essentially every cell, essential for mitochondrial energy production, DNA repair, and sirtuin activity — a family of enzymes regulating gene expression, stress responses, and metabolism.

NAD+ levels decline measurably with age — in some tissues by up to 50% between young adulthood and age 70.

Approximation based on cross-sectional tissue data — NAD⁺ declines up to 65% between young adulthood and age 80.

Massudi et al. 2012 · Camacho-Pereira et al. 2016

NMN as a precursor

NMN (nicotinamide mononucleotide) is a direct precursor to NAD+. The hypothesis: supplementing NMN raises NAD+ levels and activates sirtuins.

What the evidence shows

• Animal models: Robust improvements in mice — better mitochondrial function, insulin sensitivity, endurance.
• Human studies (Phase I/II): Several show that oral NMN does raise blood NAD+ levels. Functional endpoints (walking speed, sleep quality, aerobic capacity) improve modestly in some.
• Limitations: Studies are small (often under 100 participants), short (4–12 weeks), and frequently industry-funded. No long-term outcome data exists yet.

Practical application

Parameter	Recommendation
Dose	250–500 mg/day (per available trials)
Timing	Morning, with or without food
Quality	Third-party tested (NSF, Informed Sport)
Stacking	Often combined with resveratrol or pterostilbene — synergy evidence is weak

My take

NMN is one of the most mechanistically plausible longevity supplements. But: it's expensive, clinical evidence is early-phase, and the fundamentals (sleep, strength training, protein, zone 2) offer a much bigger lever for most people.

If you've covered the basics and want to experiment: defensible. If you're not yet exercising regularly: the money is better spent on a gym membership.