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NMN dosage and evidence

Written by Reviewed Sep 2026

Limited. People have taken it in a published study, but fewer than 100 of them. 4 completed trials, 94 people given it.6 reported

The short answer

NMN is a pill the body turns into NAD+. It is studied for blood sugar and strength in ageing. Early studies in people show small results, and whether it can be sold as a US supplement is disputed.

Evidence grade for NMN: Limited. The rule: people have taken it in a published study, but fewer than 100 of them. The sum on this page: 4 completed trials, 94 people given it. A grade counts how much has been done to people, not whether it works.

People given it
94
Human studies
4
Found nothing
3

Dose

No human dose established

Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose.

4 completed trials, 94 people given it

6 effects reported, 4 unwanted, 2 wanted, by people using it, not a trial

Goal pages: Fat loss and metabolism, Muscle and strength, Ageing and longevity, Heart and circulation

In plain English

In plain English, from Aaron

This is how I would explain it to a friend. The evidence, with the numbers, is further down the page.

NMN is a pill your body turns into NAD+, the helper molecule your cells use to make energy. NAD+ drops as you age. The idea is that NMN tops it back up. It is sold as a supplement. In 2022 the FDA said it does not count as one in the US. That fight is not over.

What people take it for

  • Slowing down ageing.
  • More energy.
  • Better blood sugar control.
  • Better endurance, because of what it did in mice.

What studies in people showed

Start with the people. A 60 day trial in 80 adults used 300 to 900 mg a day. Blood NAD went up. They walked a bit farther in a six minute walk test. Their insulin resistance score did not change. A 10 week trial in overweight women with prediabetes used 250 mg a day. Their muscle got better at using insulin. Every other blood sugar number stayed the same. So the blood number moves. That part is easy. Feeling or measuring anything better is the hard part, and that mostly has not happened. Nobody has shown NMN slows ageing in a person. In mice, one study gave old mice NMN for 12 months. They had better blood sugar control, more energy, moved around more, and their eyes worked better.

What people report

Reports, not study results

The good

  • Some people feel more awake in the first few weeks.
  • Most people say it is easy on the body.

The bad

  • Headaches in the first week or two. This is the most talked about complaint.
  • Nausea or feeling tired when starting.
  • A lot of people feel nothing at all and quietly stop.
  • Product quality is all over the place, so you may not be getting what the label says.

Where these come from: The trial side effect tables say it was well tolerated. The headache, nausea and no-effect reports are from longevity forums and from sites that pool Reddit posts. Those are not from a trial.

My bottom line

The mouse story is real. The human story is a blood number and a slightly longer walk. I would not spend money on this before my blood work says I am missing something.

An opinion, not a finding. I am a coach, not a doctor.

What it has been measured to do

Measured in people

Goals NMN has been tested for in people, biggest studies first. We count only what the studies on this page say, so the real numbers may be higher.

What people using it report

Real people telling you what happened to them. Nobody checked it, and the people who post are not a fair sample, so it cannot prove anything works. It is still the best guide on this page to what people actually do with NMN, what they expect, and what goes wrong. The full account, including the negative reports, is below.

29 of the 36 indexed goals have no study of any kind behind NMN

No study in people, animals or cells on this page reports a result for these. That does not prove NMN does nothing for them. It does mean anything you have heard about NMN and one of these did not come from a study cited here.

Losing weightFeeling less hungryLosing fat specificallyKeeping or building muscleLiver fat and liver healthInflammationJoint and knee painTendon, ligament and injury healingWound and skin healingGut and digestionBone strengthImmune functionPainEyes and visionMemory and thinkingMood and anxietyEnergy and fatigueSkin, wrinkles and elasticityHairTanning and pigmentationGrowth hormone and IGF-1Testosterone and male hormonesLibido and sexual functionThyroidHeart attacks and strokesKidney functionLiving longerCancer and tumoursBiological age markers

When this earns a spot

It matters as a research compound the body turns into NAD, with some studies in people on metabolism and NAD levels. It is not a shortage you can find and fix with a standard blood test. Testing what is really in the product matters here more than for most bottles. Two products sold as NMN had no NMN in them. That is on /supplements/quality.

Bloodwork that belongs beside the bottle

A metabolic panel is optional, as a safety check. Testing the product beats a vanity NAD number.

There is no must-do blood test for this one. We say so on purpose.

Test again after about 90 days. If that blood number did not move, stop.

  • There is no standard NAD blood test this site treats as a reason to start or stop.
  • A metabolic panel does not prove the capsule did anything.

Reading the number

If you cannot name what you will measure again, you are taking a bottle of hope. Compare the nicotinamide riboside page instead of taking both by default.

What people typically order

No blood test required. Check quality and what is really in it first. Brand partners: /guides/supplement-partners.

Bloodwork partnersSupplement brand partners
Show full evidence

What is NMN?

NMN is a pill the body turns into NAD+. It is studied for blood sugar and strength in ageing. Early studies in people show small results, and whether it can be sold as a US supplement is disputed.

NMN is a molecule the body turns into NAD+. Early studies in people looked at blood sugar control, muscle and blood markers, and found modest results. In 80 healthy middle-aged adults, it raised NAD in the blood and helped a little with a six-minute walk. In a small group of women with prediabetes, muscle responded better to insulin, and nothing else changed. In 14 older men with diabetes, grip and walking speed were no different from a dummy pill. In mice, it improved how the body handled sugar, endurance and signs of ageing.

In 2022 the FDA ruled that NMN does not count as a dietary supplement, because it had already been cleared for study as a drug. So its status as a US supplement is disputed.

How does NMN work?

The body turns it into NAD+ through a recycling route called the salvage pathway. The aim is to bring back NAD+ levels that fall with age.

What have studies in people found about NMN?

NAD in the blood goes up. How well people move or function mostly does not. The one good blood sugar result is in a narrow group. The studies of strength and walking in older or heavier adults are mixed or found nothing.

  • Yi 2023: 80 adults took 300 to 900 mg a day for 60 days. NAD in the blood rose. The six-minute walk improved a little. A score of blood sugar handling did not change.
  • MIB-626 2023: 30 overweight or obese adults took 1000 mg twice a day for 28 days. Weight, the lower blood pressure number and LDL cholesterol fell. Muscle function and response to insulin did not change. The maker paid for it.
  • Akasaka 2023: 14 older men with diabetes and weak grip or slow walking took 250 mg a day for 24 weeks. Grip and walking speed were no different from the dummy pill. Teijin paid for it.
  • Yoshino 2021: women past menopause who were overweight or obese and had prediabetes took 250 mg a day for 10 weeks. Their muscles responded better to insulin. Nothing else about their metabolism changed.

What this does not tell you: No study has tested whether NMN slows ageing in a person. The walking and weight results come from short, small studies, and some were paid for by the maker. More NAD in the blood is not a health result.

What do people who took NMN report?

This is what real people say happened to them, good and bad. Nobody measured it. A report cannot tell a real effect from the lift people get just from expecting it to work, from a diet or training change made at the same time, or from what was really in the vial. We still put it near the top. It is the next best thing to a study in people: what happens when real people use it, including what goes wrong.

  • The long-running experience threads are dominated by people reporting nothing. Accounts of taking a gram daily for months, of pushing to two grams for a stretch, and of cycling through high, low and no doses while finding nothing that correlates, appear repeatedly and are written by people who wanted it to do something.
  • Where people do report a change, it is energy, strength or endurance in training, and the ones reporting it most often are taking it under the tongue rather than swallowing it. Whether taking it under the tongue makes any difference is one of the longest-running arguments in the discussion and is not settled by anyone.
  • Doses described range widely, from a few hundred milligrams once a day to several hundred taken repeatedly through the day, and there is no consensus pattern. People adjust up and down largely by feel.
  • The negative reported most often is sleep. Taking it later in the day is repeatedly described as producing enough stimulation to prevent sleep or to cause waking in the early hours, and insomnia appearing after several consecutive days shows up as a distinct pattern.
  • Worsening tinnitus is raised as a specific complaint by a subset of users, across both NMN and nicotinamide riboside, and is disputed within the same threads.
  • Product authenticity is a persistent theme. People describe testing that found a product containing a small fraction of the NMN claimed, describe a flushing reaction and conclude they were sold niacin, and argue that in-house purity certificates with no named laboratory are worthless. Third party HPLC or mass spectrometry testing is treated as the only way to know, and the price a vendor charges is used by some as a rough sanity check.
  • Doubt that it is anything more than expecting a result runs throughout. Longer-standing members regularly point out that the people who report benefit are the people who bought it expecting benefit, and that objection is made by people who take it themselves.

Sources: The NMN personal experience threads, the under the tongue thread, supplier and purity threads, and the NAD+ subforum generally on LongeCity, found by site-restricted search, September 2026. Nothing above is attributed to any specific post and no post is reproduced.

The evidence, in charts

Fig. 1a · how many people

94people, across 2 studies in people cited here

094 people
How many people: 94 people across 2 cited studies in people, drawn as one bar split into one block per study. The largest study holds 80 of them, 85 percent of the total.
People in each cited study in people
StudyPeopleShare
GeroScience 20238085%
Geriatrics and Gerontology International 20231415%

One study holds 85% of these people, so the total rests more on one study than its size suggests. Counts are the number of people each study on this page says it signed up. That includes studies that only watched people and gave nobody the compound. 2 more studies in people give no headcount and are not counted here. Studies still signing people up are left out, and only studies cited on this page are counted.

Fig. 1b · evidence mix

4 of 5 sources here are studies in people. The rest is not.

05 sources
  • Study in people · done in people480%
  • Animal study · done in animals120%

Counted from the list of sources on this page. It counts only what we cite, so there may be more studies out there. A review counts once, however many studies it sums up.

Fig. 2 · evidence over time

The studies cover 3 different years, 2016 to 2023, counted from the list of sources on this page.

Fig. 3 · legal status at a glance

Not approved in any of the four countries shown. This is what the law says, not a verdict on the science. See Legal status below for the full text and any notes.

Fig. 4 · how much does what

Nobody has tested different amounts in people

This chart would show how the effect changes as the amount goes up. For this compound, nobody has measured that in people. So we leave it empty. We will not borrow an animal chart and pretend it works the same in people.

Waiting on a study nobody has runMaking one takes a study that gives different amounts to different groups of people and compares them. Nobody has paid for that for this compound.

Fig. 5 · what the molecule is

Kind of compound
Supplement
Molecule weight
334.2 Da
Half-life
Stated in words, not a numbersee the exact wording below
Chain length
None on file

No amino acid sequence is on file for NMN, which is expected: a supplement is not built from amino acids.

The studies we cite

Common questions

Has NMN been tested in people?

Yes. 94 people given it across 4 completed trials cited here, 3 of which found nothing. NMN is a pill the body turns into NAD+. It is studied for blood sugar and strength in ageing. Early studies in people show small results, and whether it can be sold as a US supplement is disputed.

What is the NMN dosage?

No human dose established. Amounts that were given in studies sit in Human evidence on this page. None of them is a personal dose. 4 completed trials, 94 people given it

Is NMN FDA-approved?

Not an approved drug; whether it can be sold as a US supplement is disputed

Is NMN better than NAD+ directly?

NMN is something the body turns into NAD+, and it is easier to take as a pill. But nobody has shown that either one really slows aging in people.

Latest reading on NMN

Blog posts about NMN, newest first.

Compare NMN with

NMN vs Nicotinamide RibosideNMN vs ResveratrolNMN vs NAD+NMN vs MIB-626NMN vs NicotinamideNMN vs NMNHNMN vs TrigonellineNMN vs Taurine

Related compounds

NAD+