Question explored with the scientific record
Is nmn good for 60 year old women who is 3 stone overweight
The evidence for NMN helping a 60-year-old overweight woman lose weight or improve her health is thin and comes with a warning sign.
The only human trial that directly tested NMN in a similar population—obese postmenopausal women with prediabetes—found a 25% improvement in muscle insulin sensitivity after 10 weeks of 250 mg/day [2]. However, a critical commentary on that same trial points out a major flaw: the NMN group started with much lower liver fat than the placebo group (6.3% vs 14.8%, p=0.003) [2]. This baseline imbalance means the reported benefit could be due to the groups being different from the start, not the supplement. The trial was also small, with only 25 women total [2].
A larger 60-day trial in 80 healthy middle-aged adults found that NMN (300-900 mg/day) raised blood NAD levels and improved walking distance, but it also raised a red flag: HOMA-IR, a measure of insulin resistance, increased in the 600 mg and 900 mg groups [4]. For an overweight woman already at risk for metabolic problems, a supplement that might worsen insulin resistance is a real concern. The same trial reported no serious side effects, but it only lasted 60 days, so long-term safety is unknown [4].
A 2024 systematic review of six RCTs concluded NMN raises blood NAD and is well-tolerated in the short term, but it also noted that the studies were mostly in healthy Japanese and Indian adults, not specifically in overweight older women [3]. A 2025 user survey of 196 people taking a multi-ingredient NMN supplement reported mostly positive feedback, but only 1% of those positive reports mentioned weight management, and the survey had no control group, so it proves nothing about cause and effect [1].
My call: the evidence does not support taking NMN for weight loss or metabolic health in a 60-year-old overweight woman. The one relevant trial is confounded, and higher doses may actually worsen insulin resistance. Confidence: low.
Sources used 4
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Real-world User-reported Benefits of a Multi-ingredient NMN-based Supplement Targeting Age-related Decline: A Brief Report
Self-reported real-world outcomes from 196 Wonderfeel Biosciences NMN-based supplement users indicate perceived benefits across multiple body systems, but causal efficacy cannot be established due to lack of controls or biomarkers.
DOI: 10.11648/j.ijnfs.20251404.12 -
Comment on “Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women”
A critical commentary arguing that Yoshino et al.'s NMN trial in prediabetic women is confounded by imbalanced hepatic lipid content between groups, calling into question the reported muscle insulin sensitivity improvements.
DOI: 10.1126/science.abj1696 -
EFFICACY OF NICOTINAMIDE MONONUCLEOTIDE SUPPLEMENTATION (NMN) IN BLOOD NICOTINAMIDE ADENINE DINUCLEOTIDE (NAD) FOR ANTI-AGING IN ADULTS: A SYSTEMATIC REVIEW
A systematic review of six RCTs found that oral NMN supplementation (250–900 mg/day for 10–12 weeks) significantly increased blood NAD concentrations in adults, with only mild adverse effects, supporting its potential anti-aging benefit.
DOI: 10.61841/gyj2gr52 -
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
In a 60-day double-blind dose-ranging trial in 80 healthy middle-aged adults, oral NMN (300-900 mg/day) raised blood NAD, improved walking distance, and prevented biological-age increase while being safe, although HOMA-IR rose in the 600 and 900 mg groups.
DOI: 10.1007/s11357-022-00705-1