A Harvard scientist made NMN the molecule of the longevity set. Here is what he takes, what human trials found, and what the FDA fight was about.
This in-depth guide covers everything you need to know about nmn supplement: what sinclair takes and what trials show. Based on verified income data and real-world case studies from our database of 138 side hustle tactics.
An NMN supplement is a precursor your body turns into NAD+, a molecule cells use to make energy, and human trials show it reliably raises NAD+ in the blood. What those trials have mostly failed to show is a clear health payoff: pooled reviews find no meaningful effect on blood sugar, cholesterol or muscle in fairly healthy adults. David Sinclair made it famous, the FDA dropped its objection to NMN as a supplement in September 2025, and a month of NR costs about $36 to $49 while one NAD+ IV session can run several hundred dollars.
Why NMN became the billionaire molecule
Picture a Harvard geneticist taking a gram of NMN every morning and shaking resveratrol into his yogurt. That image, from his 2019 book, gave NMN a face.
The geneticist is David Sinclair, a professor in the Department of Genetics at Harvard Medical School's Blavatnik Institute, whose early research focused on sirtuins, enzymes that respond to changing NAD+ levels. In his book Lifespan he described his own routine in the first person, and NMN sat at the top of the list (Lifespan, quoted on Goodreads).
Bryan Johnson, the software founder behind the Blueprint protocol, lists "NR (450 mg) or NMN (500 mg)" in the published version of his Blueprint protocol. His full stack and its price live in our Bryan Johnson supplements list, and the wider picture of what the ultra-rich swallow each morning is in what supplements billionaires take.
Sinclair also co-founded a drug company working on NMN. Lifespan.io reported that Metro International Biotech was "co-founded by Rajendra Apte and David Sinclair," and that Metro developed MIB-626, a proprietary form of NMN, as an investigational drug (Lifespan.io, November 2022). That company's drug program later set off the FDA fight described below.
So a famous scientist, a drug company and a supplement industry all pull on NMN. Does knowing who profits change how you read the marketing?
What David Sinclair says he takes
In his book Lifespan (2019), Sinclair wrote: "I take 1 gram (1,000 mg) of NMN every morning, along with 1 gram of resveratrol (shaken into my homemade yogurt) and 1 gram of metformin." In the same passage he listed a daily dose of vitamin D, vitamin K2 and 83 mg of aspirin, said he tries to skip one meal a day, and described having his blood drawn every few months for biomarker testing (Goodreads quote page for Lifespan).
That list is dated 2019. Seller pages claiming his "2026 stack" disagree with each other on doses, and I found no newer first-person list I could verify, so this post sticks to the book.
One item on it, metformin, is a prescription diabetes drug. Its longevity case belongs in our post on rapamycin, metformin and GLP-1 drugs for longevity. Nobody should copy a prescription drug from a book.
His 1 gram of NMN is four times the 250 mg used in two of the human trials covered below. A daily gram has been tested in some studies, but the best-known positive result came from a quarter of that.
His own podcast, Lifespan with Dr. David Sinclair, has a full episode on these molecules, titled "NMN, NR, Resveratrol, Metformin & Other Longevity Molecules," released on January 26, 2022 (episode listing). The show notes include a correction (episode notes on Audible): where he says he takes 1 gram of spermidine, the active ingredient in the capsules is 1 to 2 milligrams. Even careful people misstate doses out loud.
A credibility note from 2024
In February 2024, Animal Biosciences, a company Sinclair co-founded, put out a press release quoting him as saying it had "developed the first supplement proven to reverse aging in dogs." Scientists left the Academy for Health and Lifespan Research, a group he co-founded, and Sinclair stepped down as its president (Newser, summarising the Wall Street Journal, April 2024). He said the approved wording was "proven to reverse the effects of aging in dogs," and the company issued a corrected release in which his quote reads "shown to reverse the effects of age related decline in dogs."
That episode says nothing about NMN in people. It is a reason to weigh his enthusiasm against the trial data.
What NAD+ does, in plain words
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme your cells need to convert food into energy, and it is involved with cell and tissue repair (National Geographic). The sirtuins Sinclair studies respond to its levels.
The appeal of NMN and NR rests on animal work. In rodents, obesity and aging impair the body's ability to make NAD+, and NMN availability is a rate-limiting step in making it, as the authors of the best-known human NMN trial put it in their Science paper. Raise the precursor, the theory goes, and you restore NAD+ and some of youth's repair capacity with it.
The weak link is the jump from mice to you. Raising a number in blood is one step. Living longer or feeling better is a much bigger step that needs its own proof. How often have you seen a supplement advert that skips straight from "boosts NAD+" to "turns back the clock"?
The human trials so far
Human NMN research is young. Most trials are small, last weeks to a few months, and measure markers in blood or muscle. Here is what the main ones found.
| Study | Who took part | Dose and length | What it found |
|---|
| Yoshino et al., Science, 2021 | 25 postmenopausal women with prediabetes and overweight | 250 mg/day NMN, 10 weeks | Muscle insulin sensitivity and insulin signalling rose versus placebo |
| Igarashi et al., NPJ Aging, 2022 | Healthy older men in Japan | 250 mg/day NMN, 6 or 12 weeks | Blood NAD+ rose; "nominally significant" gains in gait speed and left grip; no change in body composition |
| Liao et al., JISSN, 2021 | 48 amateur runners in training | 300, 600 or 1,200 mg/day NMN, 6 weeks | Some aerobic measures improved at the two higher doses; VO2max itself did not change |
| Yi et al., GeroScience, 2023 | 80 healthy middle-aged adults | 300, 600 or 900 mg/day NMN, 60 days | Blood NAD+ rose at all doses; six-minute walk distance improved; HOMA-IR (insulin resistance) did not differ from placebo |
| Chen et al., Current Diabetes Reports, 2024 | Meta-analysis of 8 trials, 342 adults | 250 to 2,000 mg/day, 14 days to 12 weeks | No significant benefit on fasting glucose, insulin, HbA1c or lipids |
| Zhang et al., Crit Rev Food Sci Nutr, online 2024 | Meta-analysis of 12 studies, 513 people | Various | NAD+ rose; most clinical outcomes did not differ from control; authors warn benefits may be exaggerated |
| Prokopidis et al., J Cachexia Sarcopenia Muscle, 2025 | Meta-analysis of NMN and NR trials in adults over 60 | Various | Evidence "does not support" NMN or NR for preserving muscle mass and function |
| Zhang et al., Nutrients, 2026 | Meta-analysis of 10 trials, 349 adults with raised blood pressure | Various | Diastolic pressure fell about 2 mmHg; authors call it "preliminary and suggestive" |
Single trials sometimes find a signal. When researchers pool trials together, most of those signals shrink toward zero, with blood NAD+ itself as the steady exception.
The 2021 Science trial found real gains in muscle insulin sensitivity in a small group of women. Its disclosures note that one author receives a share of patent-licensing fees from MetroBiotech, the Sinclair-linked company, and another is an inventor on an NMN patent application (PubMed record). Disclosures like this are routine, and you should still factor them in.
The Yi 2023 trial also reported that "blood biological age" stayed flat in the NMN groups while rising in the placebo group over 60 days. That measure came from a blood-test calculator called Aging.Ai 3.0, and several authors work for chemical and biotech companies (PubMed record). Sixty days is a very short window for anything called biological age.
On safety, the news is calmer. A 2026 meta-analysis of 15 trials found that NMN at 250 to 2,000 mg a day, for 14 days to 24 weeks, did not increase adverse events or liver enzymes (Yang et al., Nutrients, 2026). The same review found no significant effect on weight, fasting glucose, HbA1c or blood lipids, and a slight drop in diastolic blood pressure. The longest trial in that review ran 24 weeks. Nobody has data on taking it for 20 years, which is how long a longevity habit is meant to last.
If a pill raised a number in your blood and nothing else measurable changed, would you keep paying for it?
NMN vs NR: which precursor has more evidence
NR (nicotinamide riboside) is NMN's close cousin. The body converts both into NAD+, and NR belongs to the vitamin B3 family (Dollerup et al., 2018). NR had controlled human trials by 2018. The NMN trials in a 2024 review date from 2021 on (Chen et al., 2024).
What NR trials show:
- It raises NAD+ and is well tolerated. A crossover trial in healthy middle-aged and older adults found six weeks of NR "effectively stimulates NAD+ metabolism," and suggested future trials look at blood pressure and arterial stiffness (Martens et al., Nature Communications, 2018).
- It did not fix insulin resistance. Forty obese, insulin-resistant men took 2,000 mg a day for 12 weeks. NR was safe, but insulin sensitivity, glucose handling and body composition did not improve (Dollerup et al., American Journal of Clinical Nutrition, 2018).
- It may matter for specific diseases. In a small phase I trial, 30 people newly diagnosed with Parkinson's disease took 1,000 mg of NR or placebo for 30 days. NR raised brain NAD+ in many of them and was linked to mild clinical improvement, which the authors said warrants larger trials (NADPARK study, Cell Metabolism, 2022).
The most promising signals come from specific diseases with measurable endpoints. General "anti-aging" in healthy people has the least support.
So which should you pick? On the human evidence, the honest answer is that neither has shown a benefit for healthy people that would justify the label "longevity supplement." Charles Brenner, who discovered in 2004 that NR is a precursor to NAD and who is Chief Scientific Advisor at Niagen Bioscience, a company that sells NR, told National Geographic in September 2025, "I'm telling you that nicotinamide riboside is not a longevity drug," and the article reports he does not believe NR, NMN or NAD+ are longevity drugs (National Geographic, September 2025).
The practical differences are cost and regulation. NMN spent almost three years in legal limbo, which brings us to the FDA.
The FDA's U-turn on NMN, 2022 to 2025
The legal story of NMN explains why you may have seen it vanish from Amazon.
Late 2022: the ban. The FDA concluded that NMN was excluded from the legal definition of a dietary supplement because, in its view, NMN had been authorised for investigation as a drug before it was marketed as a supplement. Amazon later told sellers that "On November 4, 2022, the Food and Drug Administration (FDA) announced that NMN is no longer considered a dietary supplement" (NutraIngredients, February 2023). The drug in question was Metro's MIB-626. Lifespan.io reported that Metro had written to the FDA in December 2021 asking it to apply this exclusion to protect drug developers from supplement competition (Lifespan.io, November 2022).
Early 2023: Amazon pulls it. Amazon told sellers they could keep offering NMN products until March 13, 2023, and that NMN products could "no longer be sold or distributed as a dietary supplement" (NutraIngredients, February 2023).
2023 to 2025: the fight. The Natural Products Association filed a citizen petition with the FDA and sued the agency in federal court in Washington, DC (NPA, September 2025).
September 29, 2025: the reversal. In two letters dated that day, the FDA confirmed that NMN is not excluded from the definition of a dietary supplement. The agency found enough evidence that NMN was marketed as a supplement in the US before it was authorised for drug investigation (Venable LLP, October 2025). The NPA says the FDA acknowledged evidence that NMN was sold as a supplement "as early as 2017" (NPA).
Where does that leave things in 2026? Lawful to sell, with caveats. Venable's lawyers note that NMN remains a new dietary ingredient, so each seller must file its own notification unless it uses an ingredient from a supplier that already has one. They also warn that the decision "reflects only the FDA's current thinking and could be reconsidered or reversed" (Venable LLP).
One thing the FDA ruling did not do: it said nothing about whether NMN works. "Lawful supplement" is a legal category about marketing history. Under US law, the FDA does not have the authority to approve dietary supplements before they are marketed.
NAD+ IV drips: what clinics charge
If you live in a big city, you have probably walked past a wellness lounge with reclining chairs and an NAD+ drip on the menu. What are you actually buying?
The price. One Arizona provider publishes its menu: NAD+ add-ons range "from $75 for 100 mg to $675 for 1,000 mg," on top of base fluids at $99 for a mobile visit or $94 in clinic, plus exam fees, as of 2026 (AZ IV Medics). The same page notes NAD+ is often infused more slowly than a standard IV and can take several hours. Many clinics sell these as multi-session packages, so a "loading" course multiplies that figure.
The evidence. National Geographic reported in 2025 that NAD+ infusions are not FDA-approved, and that while NAD+ supplements and therapy are touted for longevity, "there is no evidence that it does so." Physician David Seres told the magazine, "Even thousands of anecdotes do not create evidence," and Charles Brenner said, "I'd love to see what it does head-to-head with a saline solution" (National Geographic).
The best human data on what happens to infused NAD+ comes from a small pilot study. During a six-hour IV infusion, plasma NAD+ did not change for the first two hours because the body cleared it "rapidly and completely," and the researchers then measured NAD+ and its breakdown products in urine (Grant et al., Frontiers in Aging Neuroscience, 2019). That study measured where the molecule goes. It did not test whether anyone felt or aged better.
For the price of one high-dose drip, you could buy more than a year of oral NR. Which does the evidence favour? Neither strongly, though only the oral route has outcome trials.
What NMN and NR cost per month
Here is what the oral versions cost, from sellers' own pages, as of October 2026. Brand names appear only to show real price levels, and the first one belongs to the company Brenner advises.
| Item | Price as of 2026 | What you get | Rough monthly cost |
|---|
| NR, one major brand | $49.00 one-time, $39.20 on subscription | 30 capsules of 300 mg | $39 to $49 |
| NR, a second major brand | $40.50 sale price, or $36.00 on autoship | 30 capsules of 300 mg, labelled a 30-day supply | $36 to $41 |
| NAD+ IV, one Arizona provider | $75 to $675 for the NAD+ portion, plus $94 to $99 fluids | One session, 100 to 1,000 mg | $169 to $774 per session, before exam fees |
| Sinclair's NMN dose | 1 gram a day, per his book | About 30 grams a month | Depends on the product's price per gram |
NMN prices vary widely by form (powder, capsule, "liposomal," sublingual). To compare, divide the bottle price by the total grams of NMN in it to get cost per gram. Then multiply by your daily dose and by 30.
A note on the money side. A $45 monthly habit is $540 a year. If you have been thinking about how much money is enough to feel secure, that same $540 a year put into a low-cost fund through index investing compounds over a decade. Spending it on a supplement is fine if you choose it on purpose.
NMN claims the human data does not back
Claims you will see in adverts that the human data does not back up as of 2026:
- That NMN or NR makes you live longer. No human trial has measured lifespan. The NMN trials pooled in a 2026 safety review lasted 24 weeks at most (Yang et al., 2026).
- That it reverses aging. Short trials using online "biological age" calculators are too weak to support that claim, and pooled reviews find few clinical changes (Zhang et al., 2024).
- That it fixes blood sugar for most people. Two meta-analyses found no significant benefit on fasting glucose, HbA1c or lipids (Chen et al., 2024; Yang et al., 2026).
- That it builds or protects muscle in older adults. A 2025 meta-analysis found the evidence does not support it (Prokopidis et al., 2025).
- That an IV drip works better than a capsule. I found no trial comparing health outcomes between the two, and the infusion study shows the body clears infused NAD+ quickly (Grant et al., 2019).
- That more is better. Sinclair's 1 gram is a personal choice. The best-known positive trial used 250 mg (Yoshino et al., 2021).
The same caution applies to other trendy compounds sold on longevity hopes. Readers of our BPC-157 guide will recognise the pattern: strong animal data, thin human data, confident marketing.
Who should skip it
These groups have the most reason to leave NMN, NR and NAD+ drips alone, or to ask a doctor first.
- Anyone pregnant or breastfeeding. I found no safety trials in pregnancy. Even Bryan Johnson's own protocol page lists nicotinamide riboside among the items that "should be avoided during pregnancy" (Blueprint protocol).
- People being treated for cancer or with a history of it. NAD+ is part of every cell's energy machinery, and long-term human safety data does not exist. That is a conversation for your oncologist.
- People on several prescription drugs. Interaction data for NMN is thin. Your pharmacist can check what you take.
- Anyone with a tight budget. If $40 to $50 a month would squeeze your rent or your savings, the evidence does not justify it.
- Anyone tempted by IV drips at a lounge. An IV is a medical procedure, and NAD+ infusions are unapproved. National Geographic also flagged the risk that IV solutions outside FDA oversight might contain impurities (National Geographic). If you do one, choose a licensed medical provider.
This post is general information only. Talk to your doctor before starting any supplement, especially at high doses, if you take prescription medicines, or before any IV therapy.
What would change your mind here: a bigger trial, a doctor's advice, or simply how you feel after a few months?
Your NAD+ plan this week, mostly free
You can copy the parts of the Sinclair routine with the most support for almost nothing. Most of them are habits he lists next to his supplements in the same passage of Lifespan (Goodreads quote page).
- Walk more and take the stairs. Sinclair lists lots of daily steps and walking upstairs. Cost: $0.
- Lift something twice a week. He goes to the gym most weekends. Bodyweight squats and push-ups at home cost $0.
- Cut back on sugar and refined carbs. He says he gave up desserts at 40. Cost: you probably save money.
- Get a basic blood panel at your next checkup. Sinclair tests every few months. Ask your doctor whether a basic panel is due at your next visit. Our Function Health review covers paid consumer panels if you want more.
- If you still want to try NMN or NR, run it as an experiment. Pick one product with third-party testing, write down how you feel and your blood work before you start, take it for three months, and decide based on what changed. Budget: roughly $40 to $50 a month.
Which of those five could you start before the weekend? The walking and the sugar cut cost nothing and come with no FDA saga.