Taking 1 gram of NR or NMN every day for two weeks can double a key energy molecule in your blood, but taking half a gram of regular niacin (Nam) doesn’t seem to do much — so NR and NMN might be better for boosting your body’s energy levels.

What we've found so far is that the evidence we've reviewed leans toward NR and NMN being more effective than niacin (Nam) at boosting NAD+ levels in healthy adults [1]. Our analysis of the available research shows that taking 1 gram of NR or NMN daily for two weeks may double a key energy molecule linked to NAD+ in the blood [1]. In contrast, taking 500 mg of niacin (Nam) does not appear to have a noticeable effect on this same marker [1]. We looked at 67.0 assertions from studies, and all of them support the idea that NR and NMN are more effective than this form of niacin for raising NAD+ levels [1]. None of the assertions we analyzed refuted this [1]. Still, our current analysis is based on limited comparisons—specifically, one type of niacin (Nam) at a specific dose and timeframe. We cannot say how other forms of niacin or different dosing schedules might compare, because the evidence we've reviewed so far does not address those. It’s also important to note that while the data we’ve seen points in one direction, our understanding is still evolving. We’re not measuring long-term effects, health outcomes, or side effects—just the impact on NAD+ markers in short-term use. And while doubling an energy-related molecule sounds promising, we don’t yet know exactly what that means for energy, aging, or overall health based on this evidence alone. The takeaway: If you're looking to boost NAD+ levels in the short term, what we've found so far suggests NR and NMN may do more than the specific dose of niacin (Nam) studied. But more research could change how we see this picture over time.