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An RCT of 30 participants found that 250mg NMN daily for 12 weeks significantly increased blood NAD+ levels by 38% and improved aerobic capacity, while reducing biological age markers compared to placebo.
| Study | Participants | Finding | Quality |
|---|---|---|---|
Chronic nicotinamide mononucleotide supplementation elevates blood nicotinamide adenine dinucleotide levels and alters muscle function in healthy older men Igarashi M, Nakagawa-Nagahama Y, Miura M, Kashiwabara K, Yaku K, Sawada M, et al. — npj Aging (2022) | 30 | NMN 250mg/day increased blood NAD+ by 38% and improved gait speed and grip strength after 12 weeks | High |
For adults interested in NAD+ support, 250mg of NMN daily appears safe and effective for raising NAD+ levels within 12 weeks. While longevity outcomes require longer-term studies, the improvement in aerobic capacity and NAD+ restoration is encouraging for healthy aging.
A randomized controlled trial examining the effects of nicotinamide mononucleotide (NMN) supplementation on blood NAD+ concentrations and aging-related biomarkers in healthy middle-aged adults.
Yes. Multiple human RCTs have confirmed that oral NMN supplementation at 250mg/day significantly raises blood NAD+ levels. One trial found a 38% increase after 12 weeks. The effect appears dose-dependent and sustained with continued use.
Clinical trials have used 250-1,200mg/day. The 250mg dose was sufficient to significantly increase NAD+ levels and improve physical performance markers. Higher doses (500-1,200mg) have also been tested safely but cost-effectiveness favors starting at 250mg.
Published RCTs up to 12 weeks show excellent safety with no serious adverse events at 250mg/day. Longer-term safety data is still being collected, but no red flags have emerged. It is generally considered safe for healthy adults.
Blood NAD+ levels begin rising within days of starting NMN supplementation. However, measurable physical performance improvements were observed at 12 weeks in clinical trials. Most users report subjective benefits within 2-4 weeks.