Taking NMN for up to 3 months might slightly lower insulin resistance, but the effect is so small it probably doesn’t matter—and it goes away if you ignore certain studies.

What we've found so far is that short-term NMN supplementation does not appear to meaningfully reduce insulin resistance in humans. The evidence we’ve reviewed leans against this idea. Our analysis of the available research shows that, while one assertion suggested NMN might slightly lower insulin resistance over up to three months, the overall body of evidence does not support a meaningful effect [1]. In fact, when we looked at the data behind that claim, we found that the small improvement seen disappeared when certain studies were excluded—suggesting the result may not be reliable [1]. Across all the assertions we analyzed, zero supported a real benefit, while 45.0 refuted the idea that short-term NMN use reduces insulin resistance [1]. We want to be clear: our current analysis does not find enough evidence to say that taking NMN for a few months helps improve how the body responds to insulin. The numbers we’ve seen point in the opposite direction. That doesn’t mean future studies won’t change our understanding—it just means this is where the data stands today. We also recognize that “insulin resistance” is a complex measure. It reflects how well your cells respond to insulin, a hormone that controls blood sugar. When resistance is high, the body has to work harder to manage glucose, which can lead to health issues over time. But based on what we’ve reviewed so far, NMN doesn’t seem to shift this in a meaningful way over the short term. As always, our analysis is based only on the evidence submitted so far. More data could change how we interpret these findings in the future. Practical takeaway: If you’re looking to improve insulin sensitivity in the short term, the evidence we’ve seen doesn’t suggest NMN will help.