Longevity supplements are becoming increasingly popular, and one molecular compound gaining attention is nicotinamide mononucleotide (NMN). Naturally found in the body, NMN converts directly to nicotinamide adenine dinucleotide (NAD+), a coenzyme that contributes to energy production, metabolism, and overall cellular health, making it a key player in how our bodies function over time.
So, what exactly is NMN, and why is it being promoted by so many wellness influencers? In this article, we look at how NMN works in your body, and we break down the claims around this popular wellness supplement.
Naturally found in the body, NMN converts directly to NAD+, a compound essential for good health. An increase in NAD+ is associated with increased energy production and faster cellular repair.
Pojednic explains it this way: an NAD+ boosting supplement like NMN is not like a direct infusion of NAD+ to your body. Rather, the supplements provide essential building blocks (called precursors) that help your cells make NAD+ on their own.
“NAD+ does not occur in high concentrations in the blood,” Pojednic explains, “and in fact, that would be an indicator to the immune system that something was wrong.” By using a precursor, like an NMN supplement, your body can produce NAD+ where it’s needed—inside your cells—without setting off any alarms within your immune system.
In 2022, the Food and Drug Administration (FDA) restricted the sale of NMN supplements because they were being investigated as pharmaceutical drugs. This decision was about regulatory classifications, not safety, but it has resulted in fewer human trials on the supplements over the past several years. In 2025, the ban on NMN supplements was lifted, and the supplement is finding its way back to the market and, potentially, to more clinical trials.
What’s clear from current studies is that NMN supplements increase NAD+ concentrations, with clinical trials showing “increases in whole blood NAD+ or related metabolites after NMN supplementation, which tells us the compound is biologically active and reaching its target,” Pojednic says. Such studies could point toward promising health outcomes, such as reduced inflammation and increased energy production.
Still, Pojednic says, “translating that into healthy aging in humans is where the evidence becomes much less clear.”
While human trials on NMN supplements are limited, there is some promising research showing potential benefits, particularly insulin sensitivity, cardiovascular health, and metabolic health.
Here are some of the potential benefits of taking NMN supplements:
While these studies show exciting potential benefits of NMN supplements, more research is needed to show the long-term health benefits of NMN in the general population.
“Most human trials are relatively short, weeks to a few months, so we simply do not have robust long-term safety data,” Pojednic adds.
Anyone considering an NMN supplement, especially for long-term or high-dose use, should proceed with caution and be sure to consult with your doctor.
As NMN supplements have gained popularity, they’ve taken several forms, from IV infusions to capsules. Here are a few common NMN supplement forms:
Trace levels of NMN are also found in certain vegetables and lean meats, like broccoli, avocado, and beef, but the quantities are low and not likely to greatly impact NAD+ levels. “Rather than focusing on getting NMN directly through the diet, it’s more realistic to support NAD+ production overall through a balanced diet rich in protein that provides key nutrients like niacin and tryptophan, which help produce NAD+,” Leverich says. In other words, aim to increase your intake of niacin (vitamin B3) from foods like salmon, liver, and tuna. Other sources include legumes and fortified grains.
At doses of 250 to 2000 mg daily, there is strong evidence to show that NMN supplements increase NAD+ levels in the blood and tissues. NAD+ plays a critical role in cellular energy production, DNA repair, and metabolic health. Your cells need it to survive and help you stay healthy and active. Because NAD+ levels decrease as we age, NMN supplements have grown popular as a tool for supporting longevity and overall health.
While preliminary findings are promising, there is limited clinical evidence in humans to confirm that increasing NAD+ through NMN supplements consistently leads to optimal long-term health or anti-aging outcomes. More large-scale and long-term studies are needed to determine the real-world impact of NMN supplements.
“For now,” Leverich says, “focusing on proven lifestyle habits like a nutrient-rich diet, staying physically active, prioritizing sleep, and managing stress remains the most reliable approach for increasing NAD+ levels.”
NMN (nicotinamide mononucleotide) supplements provide your body with a precursor to NAD+, a coenzyme essential to your body’s energy production, metabolism, and overall cellular health. While NMN supplements do not supply NAD+ directly, they do help your cells produce it internally, where it’s needed most. Because NAD+ levels naturally decline with age, NMN’s ability to boost NAD+ levels is bringing it into the spotlight for potential anti-aging benefits.
NMN is best known for its ability to increase NAD+ levels, which play an important role in cellular energy and metabolic processes. Some early research suggests that increased NAD+ levels may support better metabolic health, physical function, and energy levels, with studies showing improvements in insulin sensitivity in postmenopausal women and walking speed in older adults. Still, more long-term human studies are needed to confirm any long-term anti-aging benefits of NMN supplements.
NMN is generally safe and well-tolerated in healthy adults at doses up to 1250 mg daily for short-term use. There is limited safety data for certain groups of people, though, such as pregnant or breastfeeding women, people with pre-existing health conditions, and children. Also, because most human NMN studies have been short-term, no information about long-term safety is yet available. If you’re considering an NMN supplement, especially at a high dose or for long-term use, consult a healthcare provider first.
