Taking NMN supplements probably won't help improve blood sugar or cholesterol levels in most middle-aged or older people who are already fairly healthy.

What we've found so far suggests that NMN supplementation is unlikely to improve glucose or lipid metabolism in most middle-aged and older adults who are already in fair to good health. Our analysis of the available evidence points in this direction. We reviewed 45 studies or assertions examining whether NMN (nicotinamide mononucleotide) supplements can improve blood sugar control or cholesterol levels in middle-aged and older adults [1]. All 45 supported the idea that NMN does not lead to meaningful improvements in these areas for people who are not dealing with major metabolic disorders. No studies in our analysis showed a clear benefit for glucose or lipid metabolism. This means that, based on what we've reviewed so far, taking NMN may not change blood sugar, insulin sensitivity, or blood fat levels like triglycerides and cholesterol in otherwise healthy aging individuals. It’s important to note that these findings apply mainly to people who don’t have diabetes, severe insulin resistance, or serious lipid imbalances. We are not saying NMN has no biological effects—only that, for these specific outcomes, the evidence we’ve reviewed leans toward no significant improvement. Our current analysis does not rule out the possibility that certain subgroups, such as those with existing metabolic issues, might respond differently. But for the general healthy middle-aged or older population, metabolic markers don’t appear to shift meaningfully with NMN use. As always, new data could change our understanding. We update our analysis as more evidence becomes available. Practical takeaway: If you're a healthy middle-aged or older adult hoping to lower blood sugar or improve cholesterol with NMN, the evidence we’ve seen so far suggests you may not get that benefit.