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Longevity supplements are becoming increasingly popular, and one molecular compound that is gaining attention is nicotinamide mononucleotide (NMN). NMN occurs naturally in the body and is directly converted into nicotinamide adenine dinucleotide (NAD+), a coenzyme that contributes to energy production, metabolism, and overall cellular health, and plays an important role in the functioning of our bodies over time.<\/p>\n
The growing interest in NMN coincides with a broader cultural shift in how people think about aging. As registered dietitian Avery Zenker points out, “Longevity science focuses not only on extending lifespan, but also on extending healthy lifespan.” In other words, healthy life expectancy is not just about living longer, but also about living better as you get older. According to Zenker, “NMN stands out in that it can impact both lifespan and healthspan.”<\/p>\n
So what exactly is NMN? And why is NMN being promoted by so many wellness influencers? In this article, we look at how NMN works in the body and break down the claims about this popular wellness supplement.<\/p>\n
NMN, which is naturally present in the body, is directly converted to NAD+, a compound essential for health. Increased NAD+ is associated with increased energy production and faster cellular repair.<\/p>\n
New research shows that NAD+ levels drop significantly during midlife. According to Dr. Rachel Pojednic, chief scientific officer at RestoreLabs and Restore Hyper Wellness, the popularity of NMN supplements is based on the idea that “supplementing with NMN may increase NAD+ availability and support cellular processes associated with healthy aging.”<\/p>\n
Po\u017eedni\u0107 explains: Supplements that boost NAD+, like NMN, do not inject NAD+ directly into your body. Rather, supplements provide essential building blocks (called precursors) that help cells produce their own NAD+.<\/p>\n
“NAD+ does not occur in high concentrations in the blood; in fact, it is an indicator to the immune system that something is wrong,” Pojedonic explains. Using precursors like NMN supplements allows the body to produce NAD+ where it is needed (inside the cells) without setting off an alarm within the immune system.<\/p>\n
Although research has shown that NMN supplements can increase NAD+ concentrations, there is limited research linking these increases in NAD+ levels to changes in body composition and disease risk.<\/p>\n
In 2022, the Food and Drug Administration (FDA) restricted the sale of NMN supplements, saying they were being investigated as drugs. Although this decision was about regulatory classification rather than safety, human trials for supplements have declined over the past few years as a result. In 2025, the ban on NMN supplements will be lifted and the supplement will return to the market, possibly with further clinical trials.<\/p>\n
What is clear from current research is that NMN supplements increase NAD+ levels, and clinical trials have shown “increases in whole blood NAD+ or related metabolites after NMN supplementation, indicating that the compound is biologically active and on target,” Pojedonic says. Such research could show promising health outcomes, such as reduced inflammation and increased energy production.<\/p>\n
Still, Pojedonic says, “If you translate that into healthy aging in humans, the evidence becomes even less clear.”<\/p>\n
Although human trials on NMN supplements are limited, there are some promising studies showing potential benefits, especially on insulin sensitivity, cardiovascular health, and metabolic health.<\/p>\n
Here are some potential benefits of taking NMN supplements.<\/p>\n
Chronic, low-grade inflammation (commonly known as “inflammation”) associated with aging gradually depletes NAD+ levels. NMN supplements provide precursors that help replenish these reduced levels and support cellular health over the long term.<\/p>\n
Increased NAD+ levels may reduce inflammation throughout the body and protect cells from DNA damage and oxidative stress associated with cancer and neurological diseases such as Alzheimer’s disease.<\/p>\n
One study found that NMN improved insulin sensitivity, an important marker of metabolic health, in muscle in postmenopausal women with prediabetes and obesity. There are no data to indicate whether this finding applies to other populations.<\/p>\n
One study showed that NMN supplementation increased NAD+ levels and increased walking speed in older adults. Additionally, participants reported improved sleep quality, suggesting a supportive effect on recovery and daily energy.<\/p>\n
Non-human studies have shown that NMN supplements improve cognitive function and reduce brain plaques associated with Alzheimer’s disease.<\/p>\n
Although these studies demonstrate interesting potential benefits of NMN supplements, further research is needed to demonstrate the long-term health benefits of NMN in the general population.<\/p>\n
In healthy individuals, a dose of 1250 mg per day appears to be safe and well tolerated for short-term use. “However, there is a lack of safety data on other populations, such as pregnant and breastfeeding women, children and young people, people with pre-existing health conditions, and people taking medications that may interfere with NAD+ and NMN processing,” Professor Zenker says.<\/p>\n
\u201cMost human trials are relatively short, ranging from a few weeks to a few months, so there is no solid long-term safety data at all,\u201d Pojedonic added.<\/p>\n
Anyone considering taking NMN supplements, especially long-term or high doses, should proceed with caution and always consult a doctor.<\/p>\n
As NMN supplements have grown in popularity, they have come in a variety of formats, from IV drops to capsules. Here are some common NMN supplement forms.<\/p>\n
Registered dietitian Jane Leverich points out that oral NMN supplements, in powder or capsule form, are the most commonly studied and proven to safely increase NAD+ levels at appropriate doses. \u201cAlthough other delivery methods may be touted as more effective, there is not strong enough evidence to support their safety or that they have additional benefits,\u201d she says.<\/p>\n
Trace amounts of NMN are also found in certain vegetables and red meats such as broccoli, avocados, and beef, but the amounts are so small that they are not thought to have a significant effect on NAD+ levels. “Rather than focusing on getting NMN directly from the diet, it is more practical to support NAD+ production overall through a balanced diet rich in protein, which provides important nutrients such as niacin and tryptophan that aid in NAD+ production,” says Leverich. In other words, aim to increase your intake of niacin (vitamin B3) from foods such as salmon, liver, and tuna. Other sources include legumes and fortified grains.<\/p>\n
There is strong evidence that at doses of 250 to 2000 mg daily, NMN supplements increase NAD+ levels in the blood and tissues. NAD+ plays an important role in cellular energy production, DNA repair, and metabolic health. It is necessary for cells to survive and helps them stay healthy and active. NAD+ levels decrease with age, making NMN supplements an increasingly popular tool to support longevity and overall health.<\/p>\n
Although preliminary findings are promising, there is limited clinical evidence in humans confirming that increasing NAD+ with NMN supplementation consistently leads to optimal long-term health or anti-aging outcomes. Larger, long-term studies are needed to determine the real-world effects of NMN supplements.<\/p>\n
“For now, focusing on proven lifestyle habits like eating a nutritious diet, staying physically active, prioritizing sleep, and managing stress remains the most reliable approach to increasing NAD+ levels,” says Leverich.<\/p>\n