Based on the best available evidence, NMN does not meaningfully lower cholesterol. A 2024 meta-analysis pooling data from 12 randomized controlled trials found no significant changes in LDL cholesterol, HDL cholesterol, or total cholesterol in people taking NMN compared to placebo. The average LDL reduction was just 2.1 mg/dL, a change so small it falls well within statistical noise. If you’re looking for a supplement to manage cholesterol, NMN is not it.
What the Largest Review Actually Found
The most comprehensive look at NMN and blood lipids comes from a systematic review and meta-analysis published in Critical Reviews in Food Science and Nutrition, which analyzed data from nine studies covering triglycerides and eight studies covering cholesterol. Across all participants, NMN supplementation produced no statistically significant changes in LDL, HDL, or triglycerides when the full dataset was pooled together.
The numbers tell the story clearly. LDL dropped by an average of 2.1 mg/dL, HDL dropped by 1.3 mg/dL, and triglycerides dropped by 7.3 mg/dL. None of these reached statistical significance, meaning the changes were indistinguishable from what you’d expect with a placebo. For context, statin medications typically reduce LDL by 30 to 50 percent. A 2 mg/dL shift is clinically irrelevant.
The review’s authors were direct in their conclusion: an exaggeration of the benefits of NMN supplementation may exist in the field. Most clinically relevant outcomes showed no real difference between NMN and placebo groups.
One Exception: Triglycerides in Overweight Adults
There is one nuance worth noting. When the meta-analysis looked specifically at participants who were overweight or obese, NMN supplementation did show a statistically significant reduction in triglycerides. This subgroup effect didn’t extend to LDL or HDL, and it wasn’t visible when all body types were analyzed together, but it suggests NMN may have a modest triglyceride-lowering effect in people carrying excess weight.
A separate clinical study using intravenous NMN (300 mg) found that triglyceride levels dropped significantly within 30 minutes and stayed lower for at least five hours, while LDL, HDL, and total cholesterol remained unchanged during that same window. This short-term metabolic response is interesting from a research perspective but doesn’t translate to lasting cholesterol improvement.
Higher Doses May Raise LDL
One finding that gets less attention in NMN marketing is what happened at higher doses. In a multicenter, double-blind clinical trial testing 300 mg, 600 mg, and 900 mg daily doses over 60 days, the 900 mg group actually showed a statistically significant increase in LDL compared to placebo, going from an average of 133 mg/dL at baseline to 146 mg/dL at day 60. The lower doses didn’t produce this effect, but the finding is a reminder that “more is better” doesn’t apply here, and that NMN at higher doses could potentially move cholesterol in the wrong direction.
Why People Think NMN Should Help
The theoretical case for NMN and cholesterol centers on a protein called SIRT1. NMN is a precursor to NAD+, a molecule your cells need for energy metabolism. When NAD+ levels rise, SIRT1 becomes more active. SIRT1 influences how your body processes and stores fat, including pathways involved in cholesterol regulation and fat breakdown in fat cells. In lab studies, boosting NAD+ with NMN increased the activity of genes involved in fat metabolism and reduced markers of tissue dysfunction in fat cells.
This mechanism works in cell cultures and animal models. The problem is that human trials consistently fail to show the cholesterol changes you’d predict from these lab results. The gap between what NMN does in a petri dish and what it does in a living person’s bloodstream remains wide.
How NMN Compares to NR
Nicotinamide riboside (NR) is the other popular NAD+ booster, and people often wonder whether it performs differently. In a mouse study comparing both supplements head-to-head, NMN and NR both reduced body weight, blood lipids, and fatty liver markers. NMN appeared slightly more effective at lowering serum lipids than NR at the doses tested. However, both supplements unexpectedly worsened atherosclerosis (the buildup of plaque in arteries) in these mice, with NR producing a more severe effect than NMN. These were genetically modified mice prone to cardiovascular disease, so the results don’t directly apply to humans, but they highlight that lowering blood lipid numbers in animal models doesn’t automatically mean better heart health.
What NMN Does and Doesn’t Do
NMN reliably raises NAD+ levels in blood. That is the one outcome that consistently reaches statistical significance across human trials. Whether higher NAD+ translates into meaningful health improvements for most people remains unproven for the majority of outcomes studied, including cholesterol.
Safety data is reassuring in the short term. Studies testing doses from 300 to 900 mg daily for up to 60 days have found no significant impact on liver, kidney, heart, or pancreas function markers. NMN is generally well tolerated. But “safe to take” and “effective for cholesterol” are two very different claims. If your goal is lowering LDL or improving your lipid panel, the current evidence says NMN won’t get you there.