Key Takeaway
Meta-analysis of RCTs found NMN supplementation significantly reduced fasting blood glucose and improved lipid profiles in adults, with effects moderated by dose and duration.
Summary
This systematic review with meta-analysis pooled data from randomized controlled trials examining the effects of oral NMN supplementation on glucose and lipid metabolism in adults. The review searched multiple databases for studies comparing NMN to placebo in human participants, focusing on metabolic outcomes including fasting blood glucose, insulin, and lipid panel markers.
The meta-analysis found that NMN supplementation significantly reduced fasting blood glucose levels compared to placebo. Improvements were also observed in lipid metabolism markers, suggesting NMN may have meaningful metabolic benefits beyond its established role in boosting NAD+ levels. Subgroup analyses indicated that the effects were influenced by dosage and supplementation duration.
These findings provide the first pooled quantitative evidence from human RCTs supporting NMN's role in metabolic health. The results strengthen the case for NMN as a metabolic intervention, though the authors note the relatively small number of available trials and the need for larger, longer-duration studies to confirm these effects.
Methods
Systematic review and meta-analysis following PRISMA guidelines. Searched PubMed, Embase, Cochrane Library, and other databases for randomized controlled trials comparing oral NMN supplementation to placebo in adult participants. Outcomes included fasting blood glucose, insulin levels, and lipid profile markers (total cholesterol, triglycerides, LDL, HDL). Risk of bias was assessed, and subgroup analyses were performed by dose and duration.
Key Results
- NMN supplementation significantly reduced fasting blood glucose compared to placebo
- Improvements observed in lipid metabolism markers including total cholesterol and triglycerides
- Effects were moderated by NMN dose and supplementation duration, with higher doses and longer durations generally showing greater benefit
- Results were consistent across different participant populations
Limitations
- Relatively small number of RCTs available for pooling
- Heterogeneity in NMN dosages, durations, and participant characteristics across studies
- Most included trials had small sample sizes
- Limited long-term follow-up data available
- Publication bias cannot be fully ruled out
- Some included studies were industry-funded