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NMN's First Human Win: 250 mg a Day Lifted Muscle Insulin Sensitivity by About 25% in Prediabetic Women

BY DR. SYNAPSE · Oct 14, 2026

NMN has long been a darling of the longevity market, but human evidence was thin until a 2021 Washington University trial published in Science. In postmenopausal women with prediabetes who were overweight or obese, 250 mg of NMN daily for 10 weeks improved muscle insulin sensitivity by roughly 25%. Muscle insulin signaling and genes tied to muscle remodeling also improved, while the placebo group saw no change. But the benefit was narrow, and the study did not show NMN lowering blood sugar or reversing prediabetes. Here's what the trial found, who it applies to, and what it didn't change.