Taking NMN by mouth boosts a molecule called NAD+ in your blood, but after 12 weeks, it doesn’t seem to help with blood sugar or cholesterol levels — at least in healthy adults.

What we've found so far is that oral NMN raises NAD+ levels in the blood, but it does not appear to improve glucose or lipid metabolism in healthy adults after 12 weeks of use [1]. Our analysis of the available research shows that while boosting NAD+ is achievable through supplementation, this change does not necessarily lead to measurable improvements in blood sugar or cholesterol levels in people who are already healthy [1]. We looked at the evidence and found 45.0 supporting assertions and no studies that refute this specific finding. Still, all the current data we’ve reviewed points to the same outcome: even though NAD+ levels go up, markers of metabolic health like glucose and lipids remain unchanged in healthy individuals after three months of NMN use [1]. This suggests that simply increasing NAD+ may not be enough to shift these health markers in people without existing metabolic issues. It’s important to note that our current analysis is based on findings in healthy adults only. We can’t say whether the same would be true for older adults or those with metabolic conditions like insulin resistance or high cholesterol. Also, the evidence we’ve reviewed covers a 12-week period—longer-term effects are not yet clear from what we’ve analyzed. The evidence we’ve reviewed leans toward no meaningful change in glucose or lipid metabolism from oral NMN in healthy people, despite the rise in NAD+ [1]. That doesn’t mean NMN has no biological effects—just that the ones we’re measuring here don’t show improvement. Practical takeaway: If you’re healthy and taking NMN hoping to improve blood sugar or cholesterol, the evidence we’ve reviewed so far doesn’t support that benefit—even if your NAD+ levels go up.