NMN Dosage: How Much to Take, When and What Studies Used

Human NMN trials have used 250 to 1,250 mg a day, and the most common doses fall between 250 and 900 mg taken once a day. In the largest dose-comparison trial, 80 healthy middle-aged adults took 300, 600 or 900 mg a day for 60 days: blood NAD+ rose in every NMN group and was highest at 600 and 900 mg, and the authors judged 600 mg the point where the measured benefits peaked (Yi et al., 2023). A separate safety trial found 1,250 mg once a day for 4 weeks well tolerated (Fukamizu et al., 2022). This guide sets out the doses studied, what each trial measured, timing, and how to choose a sensible amount.

It is educational, not medical advice.

Key Takeaways

• Studied range: single doses of 100 to 500 mg (Irie et al., 2020) and daily doses from 250 mg (Yamaguchi et al., 2024) up to 1,250 mg (Fukamizu et al., 2022) have been tested in healthy adults.
• Dose response: 300, 600 and 900 mg a day all raised blood NAD+ over 60 days, with the highest levels at 600 and 900 mg (Yi et al., 2023).
• Exercise: in 48 amateur runners training 5 to 6 times a week, 600 and 1,200 mg a day for 6 weeks improved some measures of aerobic capacity more than placebo (Liao et al., 2021).
• Safety: trials up to 1,250 mg a day for 4 weeks (Fukamizu et al., 2022) and 900 mg a day for 60 days (Yi et al., 2023) reported NMN was well tolerated; longer studies are still few.
• Timing: most trials gave NMN once a day, often in the morning.

What Is NMN and Why Does the Dose Matter?

NMN (nicotinamide mononucleotide) is a building block your cells use to make NAD+, a coenzyme involved in energy metabolism. NAD+ levels tend to fall with age, which is why people take NMN to support them. Our NMN ingredient page explains the pathway, and NMN vs NAD+ covers how the precursor compares with the molecule itself.

Dose matters because the trials show a dose response for blood NAD+: in the 60 day trial, every dose raised it, but 600 and 900 mg raised it most (Yi et al., 2023). More is not automatically better beyond that point, and the studies are short.

NMN Doses Used in Human Studies

Daily dose	Who and how long	What was found
100, 250 or 500 mg (single dose)	10 healthy men, one dose each	No significant clinical symptoms or changes in heart rate, blood pressure or temperature
250 mg	11 healthy middle-aged men, 8 weeks (open label)	Well tolerated; NAD+ rose in blood cells over the 8 weeks
300, 600 or 900 mg	80 healthy middle-aged adults, 60 days	Blood NAD+ rose at every dose, highest at 600 and 900 mg; walking distance improved; well tolerated
300, 600 or 1,200 mg	48 amateur runners, 6 weeks with training	600 and 1,200 mg improved some aerobic capacity measures more than placebo
1,250 mg	31 healthy adults aged 20 to 65, 4 weeks	No changes beyond normal variation in lab tests; no severe adverse events

Sources for the table, in order: (Irie et al., 2020), (Yamaguchi et al., 2024), (Yi et al., 2023), (Liao et al., 2021), (Fukamizu et al., 2022). For what those human trials found overall, see our guide to whether NMN works.

How Much NMN Should You Take?

There is no official recommended dose for NMN. The trials point to a practical range:

• 250 to 300 mg a day was the lowest daily dose tested in healthy adults, and it raised NAD+ (Yamaguchi et al., 2024) (Yi et al., 2023).
• About 600 mg a day is where blood NAD+ and walking distance peaked in the 60 day dose trial (Yi et al., 2023).
• Up to 900 to 1,250 mg a day has been tested for 4 to 8 weeks without safety issues (Yi et al., 2023) (Fukamizu et al., 2022), but there is little data on longer use at these amounts.

Follow the serving on your product label, and talk with your doctor before going above it. Our guide to NMN before and after results covers what trials measured over time, and NMN supplement benefits covers outcomes in more depth.

When to Take NMN

Most trials gave NMN once a day. In the 8 week study, men took two 125 mg capsules once daily before breakfast (Yamaguchi et al., 2024), and morning dosing is the most common pattern. Taking it at the same time each day makes it easier to remember. If you take other supplements in the morning, NMN can usually go alongside them; check with your pharmacist if you take prescription medication. If you take resveratrol or TMG alongside NMN, see the best time to take resveratrol and TMG benefits; for studies that included women, see NMN for women.

NMN Side Effects and Safety

In the trials above, NMN was reported as safe and well tolerated, including 900 mg a day for 60 days (Yi et al., 2023) and 1,250 mg a day for 4 weeks, where lab tests stayed within normal variation and no severe adverse events occurred (Fukamizu et al., 2022). A single dose of up to 500 mg caused no significant clinical symptoms in healthy men (Irie et al., 2020).

These studies were small and short, mostly in healthy adults. Talk with your doctor before taking NMN if you are pregnant or breastfeeding, take prescription medication, or are being treated for a medical condition. Our guide to why some people stop taking NMN covers side effects people report, cost and results.

Choosing an NMN Form

NMN comes as capsules, powders, sublingual tablets and liposomal products, and the doses above were mostly given by mouth. Our comparison of NMN forms explains the trade-offs, and NMN vs NR compares the two main NAD+ precursors.

NMN is also sold as nasal sprays and mists; our NMN nasal spray guide covers what the research shows and how they compare with capsules.

Many NMN products pair it with TMG; our guide to betaine anhydrous, the same molecule as TMG, covers what studies used and the cholesterol caution at higher doses. For the resveratrol and pterostilbene side of the formula, see pterostilbene vs resveratrol.

Where Our Products Fit

Our Enhanced NMN provides 750 mg of NMN per 2-capsule serving, inside the range used in the trials above, together with 200 mg of trimethylglycine (TMG), 200 mg of resveratrol, 100 mg of pterostilbene and 750 mcg of vitamin B12 as methylcobalamin. The label serving is two capsules daily, taken in the morning with or without food, or as recommended by your healthcare practitioner. Each bottle holds 30 servings.

If you would rather use NAD+ itself, our NAD+ Nasal Spray comes in three strengths, from 35 mg to 170 mg of NAD+ per serving. It is absorbed through the lining of the nose instead of being swallowed like a capsule, so some of each dose skips digestion. Learn more on the cellular energy and mitochondrial health hub.

Frequently Asked Questions

How much NMN should I take a day?

Trials in healthy adults used 250 to 1,250 mg a day. In the largest dose trial, blood NAD+ and walking distance peaked at about 600 mg a day (Yi et al., 2023). Follow your product label and check with your doctor before taking more.

Is 250 mg of NMN enough?

250 mg a day raised NAD+ in blood cells over 8 weeks in healthy middle-aged men (Yamaguchi et al., 2024). Higher doses raised blood NAD+ further in a 60 day trial (Yi et al., 2023).

Is 1,000 mg of NMN too much?

1,250 mg once a day for 4 weeks was well tolerated in 31 healthy adults (Fukamizu et al., 2022), and 1,200 mg a day was used for 6 weeks in runners (Liao et al., 2021). Long-term data at these amounts are limited.

What is the best time to take NMN?

Most trials used a single daily dose, often before breakfast (Yamaguchi et al., 2024). Morning is the usual choice.

Should I take NMN with or without food?

In one trial men took it before breakfast (Yamaguchi et al., 2024). Follow your product label: our Enhanced NMN can be taken with or without food.

How long does NMN take to work?

Blood NAD+ was higher by day 30 in the 60 day trial (Yi et al., 2023), and aerobic capacity measures changed over 6 weeks of training in runners (Liao et al., 2021).

Can I take NMN every day?

Daily use has been studied for up to 60 days at 900 mg (Yi et al., 2023). Longer studies are still few, so check in with your doctor if you plan to use it for many months.

Does NMN have side effects?

The trials reported NMN was well tolerated, with no severe adverse events at 1,250 mg a day for 4 weeks (Fukamizu et al., 2022). Talk with your doctor if you are pregnant, breastfeeding or take medication.

Sources

1. Yi L, Maier AB, Tao R, et al. The efficacy and safety of beta-nicotinamide mononucleotide (NMN) supplementation in healthy middle-aged adults: a randomized, multicenter, double-blind, placebo-controlled, parallel-group, dose-dependent clinical trial. GeroScience. 2023. PubMed 36482258
2. Fukamizu Y, Uchida Y, et al. Safety evaluation of beta-nicotinamide mononucleotide oral administration in healthy adult men and women. Sci Rep. 2022. PubMed 36002548
3. Liao B, Zhao Y, Wang D, et al. Nicotinamide mononucleotide supplementation enhances aerobic capacity in amateur runners: a randomized, double-blind study. J Int Soc Sports Nutr. 2021. PubMed 34238308
4. Yamaguchi S, Irie J, Mitsuishi M, et al. Safety and efficacy of long-term nicotinamide mononucleotide supplementation on metabolism, sleep, and nicotinamide adenine dinucleotide biosynthesis in healthy, middle-aged Japanese men. Endocr J. 2024. PubMed 38191197
5. Irie J, Inagaki E, Fujita M, et al. Effect of oral administration of nicotinamide mononucleotide on clinical parameters and nicotinamide metabolite levels in healthy Japanese men. Endocr J. 2020. PubMed 31685720

Our products are not intended to diagnose, treat, cure or prevent any disease. This article is for education only and is not medical advice.