One of the most common questions we get at MyVitality is some version of: “The mouse studies are interesting, but what does NMN actually do in real humans?”
It’s a fair question. Animal research has long shown that NMN can boost NAD+ levels and slow age-related decline in rodents, but the picture in humans has been slower to fill in. That is changing, and one of the more rigorous human trials published to date has produced some results worth knowing about.
Published in December 2022 in GeroScience, one of the leading peer-reviewed journals in ageing research, this was a randomised, multicenter, double-blind, placebo-controlled clinical trial. That’s the gold standard design in clinical research: neither participants nor researchers knew who was taking NMN versus a placebo until the study was complete.
The trial enrolled 80 generally healthy adults aged 40 to 65 years across multiple sites. Participants were divided into four groups: placebo, 300 mg NMN daily, 600 mg NMN daily, or 900 mg NMN daily, taken for 60 days.
Researchers measured several outcomes at baseline, day 30, and day 60:
All three NMN doses produced meaningful increases in blood NAD+ concentration, with the effect scaling with dose. The 600 mg and 900 mg groups saw the largest increases, but even the 300 mg group showed a clear and statistically significant rise. No significant change was seen in the placebo group.
This is important. It confirms what earlier, smaller trials suggested: oral NMN supplementation does raise NAD+ in the blood of healthy middle-aged people, not just in mice.
All three NMN groups showed statistically significant improvements in the six-minute walk test compared to placebo at both day 30 and day 60. The greatest walking distances were recorded in the 600 mg and 900 mg groups.
The six-minute walk test is a well-validated measure used in clinical research to assess functional physical capacity. It reflects real-world ability, not just performance in a controlled gym setting, making this finding particularly relevant for people interested in maintaining energy and mobility as they age.
One of the more striking findings: blood biological age increased significantly in the placebo group over the 60-day period, while it remained essentially unchanged in all three NMN groups. The difference between NMN-treated participants and placebo was statistically significant.
While a 60-day study cannot make definitive long-term claims, this is a notable signal that warrants further investigation.
No serious adverse events were reported across any of the NMN groups. The supplement was well tolerated at all doses tested, up to 900 mg daily.
Several things make this trial stand out from earlier NMN research:
It used healthy, middle-aged adults. Many earlier human NMN studies focused on specific populations, such as prediabetic women, older men with muscle decline, or people with particular health conditions. This trial is much more representative of the kind of person who takes NMN as a daily supplement.
It was dose-dependent. The fact that higher doses produced larger NAD+ increases, and that physical performance benefits appeared across all doses, gives researchers confidence that the effects are genuinely linked to NMN rather than chance.
It was double-blind and placebo-controlled. This rules out the placebo effect as an explanation for the improvements seen.
It measured things that matter in real life. NAD+ levels in a lab are one thing. But physical performance, biological age, and subjective health are the outcomes that matter to people who want to age well.
If you’re taking NMN, or considering it, this study adds meaningful weight to the case. The doses used in the trial (300 mg, 600 mg, and 900 mg) fall within ranges commonly used in supplementation, and the 300 mg dose in particular aligns with our standard NMN capsule offering.
The physical performance findings are especially relevant if you notice your energy, stamina, or recovery starting to shift with age. Maintaining NAD+ levels as we get older is increasingly understood to be central to how well our cells produce energy, and this study suggests that NMN supplementation may help support that process in real, measurable ways.
As with all emerging research, this is one study among many, and the field continues to grow. But it is one of the more rigorous pieces of human evidence to date, and the results are encouraging.
Read the full study:
Yi L, Maier AB, Tao R, et al. “The efficacy and safety of β-nicotinamide mononucleotide (NMN) supplementation in healthy middle-aged adults: a randomized, multicenter, double-blind, placebo-controlled, parallel-group, dose-dependent clinical trial.” GeroScience, 2022. https://doi.org/10.1007/s11357-022-00705-1
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