Morning
The most common timing used in published human NMN studies. No published study has established morning is superior — but it is the most studied timing.
✓ Research consensusNMN Dosage: How Much Should You Take?
Vitality Supplements · Dosage Guide ·
NMN Dosage — how much should you take?
8 min readVitality Supplements Editorial Team
The most searched question in the NMN category — answered with reference to what published human research has actually used, and honest about where our own products sit against that range.
Dosage guide · Not medical advice · Consult a healthcare professional before starting
Quick Answer
How much NMN should you take?
Published human research has used 250mg to 900mg per day. A 2023 systematic review of 10 RCTs with 437 participants documented consistent blood NAD+ elevation and no significant adverse events across that range. 250–500mg/day is the most commonly studied band. NMN has no established RDA. Doses above 900mg are sold (including our own 1000mg product) but sit beyond the range the systematic review covered. Consult a qualified healthcare professional before starting.
UK regulatory status — September 2026
NMN is widely sold in the UK but not yet authorised: a GB novel food application for β-NMN (FSA reference RP-2116) is under assessment by the Food Standards Agency. EFSA published a positive safety opinion in the EU in 2026; formal EU authorisation is still pending and would not bind Great Britain. No health claim is authorised for NMN in the UK or EU. This page describes doses used in published research; it is not a recommendation for any individual.
Key Takeaways
Last updated: · Vitality Supplements Editorial Team · 8 min read
- 250–500mg per day is the most commonly studied range in published human NMN research
- A 2023 systematic review of 10 RCTs (437 participants) documented NAD+ elevation at all doses from 250–900mg/day
- One 4-week safety study used 1250mg/day; long-term data above 900mg is limited
- Morning is the most common timing used in published studies — consistency matters more than exact time
- Published studies used daily continuous administration — not cycling
- Three of Vitality's four NMN formulas sit inside the studied range; NMN 1000mg Pure sits above it
The Evidence
What doses does published research use?
The most important thing to understand about NMN dosage is that there is no established RDA. Published research has studied a range of doses and measured blood NAD+ across all of them.
A 2023 systematic review of 10 RCTs encompassing 437 participants documented consistent blood NAD+ elevation at doses from 250mg to 900mg per day, with no significant adverse events reported. This is the highest level of published evidence currently available for NMN. View our full research references →
We describe each study below by design — dose, duration, population and what was measured — rather than by outcome, because summarising outcomes as benefits would itself be a health claim. Read the papers for the results.
Key published human NMN studies by dose
| Study | Year | Dose | Duration | Population & endpoints measured |
|---|---|---|---|---|
| Yoshino et al. (Science) | 2021 | 250mg/day Most studied | 10 weeks | Postmenopausal women with prediabetes; blood NAD+ metabolites and muscle insulin sensitivity measured |
| Igarashi et al. (NPJ Aging) | 2022 | 250mg/day | 12 weeks | Healthy older men; blood NAD+ and muscle-function endpoints measured |
| Liao et al. (JISSN) | 2021 | 300–1200mg/day | 6 weeks | Amateur runners; aerobic-capacity endpoints measured at three dose levels |
| Okabe et al. (Front. Nutr.) | 2022 | 250mg/day | 12 weeks | Healthy adults; blood NAD+ and safety markers measured |
| Fukamizu et al. (Sci. Rep.) | 2022 | 1250mg/day Above review range | 4 weeks | Healthy adults; safety and tolerability endpoints only |
| Yi et al. systematic review | 2023 | 250–900mg/day Full range | 4–24 weeks | 10 RCTs, 437 participants; pooled blood NAD+ and adverse-event data |
Published research has measured NAD+ elevation at doses from 250mg to 900mg per day — with no significant adverse events across the studies reviewed.
What does this mean in practice? 250–500mg per day is a well-studied starting range. Higher doses up to 900mg have been studied without significant adverse events — but whether higher doses produce meaningfully greater effects is not established in the published literature. Above 900mg, one 4-week safety study exists; long-term data does not.
Important: This describes what published research has used as doses for NMN as a compound. It is not a dosage recommendation for any specific person. Consult a qualified healthcare professional before starting NMN or any food supplement.
250mgMost commonly studied dose
Used in multiple published RCTs.
500mgMid-range — well studied
Vitality NMN + Resveratrol dose.
750mgHigher studied range
Vitality NMN + TMG and NMN Complete dose.
900mgUpper limit of the systematic review
Highest dose in Yi et al. 2023.
1000mgAbove the review range
Vitality NMN 1000mg Pure dose. Covered only by the 4-week 1250mg safety study. See NMN 500mg vs 1000mg.
Starting Out
How to start taking NMN
The published research does not establish a specific starter protocol. A sensible approach based on the evidence is to begin at a well-studied dose and stay consistent rather than starting very high or frequently changing dose.
250–500mg per day is within the most commonly studied range in published human trials. The research does not establish that a gradual ramp-up is necessary — but some people prefer to start lower and assess their own response.
- Start within the published research range — 250–500mg per day is where most human studies have focused.
- Be consistent — published studies used daily continuous administration. Consistency matters more than the specific dose within the studied range.
- Give it time — published studies measured endpoints at 4–12 weeks.
- Consult a healthcare professional — especially if you are on medication, pregnant, breastfeeding or have a pre-existing condition.
- Prioritise quality over dose — >99% β-NMN purity and independent ISO/IEC 17025 batch testing matter more than whether you take 500mg or 600mg. See how to choose an NMN supplement →
When to Take NMN
Most common in research
No strong evidence against
Individual preference
Most important factor
Morning, evening or does it matter?
Timing is one of the most commonly asked questions about NMN. The honest answer: published research has not established a definitively optimal time. Studies have used various administration times, though morning is the most common.
NAD+ plays a role in circadian rhythm regulation — some researchers suggest morning timing aligns with natural NAD+ production patterns. See our NAD+ guide and the dedicated when to take NMN page.
Evening
Some researchers have suggested evening NMN may theoretically affect sleep via NAD+'s role in circadian signalling. This has not been established in published human research. Not contraindicated by published evidence.
→ No clear guidanceSplit Dosing
Some people split their daily NMN dose between morning and midday. This has not been specifically studied in published human research.
→ No research guidanceConsistency
Published studies used consistent daily administration for 4–12 weeks. Whatever time you choose — be consistent.
✓ Evidence-backed priority
Food & Absorption
Should you take NMN with food?
Published human research on NMN has used both fasted and fed administration without establishing a clear superiority for either. Some researchers have suggested that a small amount of fat may support absorption, but this has not been confirmed in published human pharmacokinetic research.
The practical answer: Follow the guidance on your product label. If you experience digestive discomfort on an empty stomach, take it with food. Either approach is consistent with what published research has used.
Also worth knowing: alcohol metabolism consumes NAD+, so taking NMN alongside heavy drinking works against the point of it. If you are on any medication, consult your GP before starting NMN. See NMN side effects & safety →
The single most important factor is not timing or food — it is purity and consistency.
Vitality NMN Products
500mg NMN per serving · inside studied range
750mg NMN per serving · inside studied range
750mg NMN per serving · inside studied range
1000mg NMN per serving · above studied range
NMN doses in the Vitality range
Four standard-NMN formulas. Three sit inside the 250–900mg range studied in published human research; one sits above it, and we say so. All are >99% β-NMN purity, UK manufactured and independently tested by an ISO/IEC 17025-accredited laboratory on every production batch. CoA on request. Full side-by-side: Compare NMN formulas →
NMN + Trans-Resveratrol 1100mg
500mg NMN with 600mg trans-resveratrol at 98% trans-isomer purity. The classic two-ingredient pairing at the most commonly studied NMN dose band.
500mg NMN600mg Trans-Resveratrol2 capsules daily
View NMN + Resveratrol →NMN + TMG 750+750mg
750mg NMN with 750mg TMG (trimethylglycine), a methyl donor. For those who want NMN paired with a methyl source and nothing else.
750mg NMN750mg TMG2 capsules daily
View NMN + TMG →NMN Complete 1600mg
750mg NMN with 750mg TMG, 50mg pterostilbene (a stilbene related to resveratrol) and 50mg apigenin (a flavone). The most comprehensive formula in the range. Ingredients explained →
750mg NMN750mg TMG50mg Pterostilbene50mg Apigenin
View NMN Complete →NMN 1000mg Pure
1000mg single-ingredient NMN. This sits above the 250–900mg range covered by the 2023 systematic review. Covered only by a 4-week safety study at 1250mg/day. For people who have used NMN before and want a higher single-ingredient dose; consult a healthcare professional first.
1000mg NMNSingle ingredient2 capsules daily
View NMN 1000mg →
FAQ
Common dosage questions
Published human research has used doses from 250mg to 900mg per day. A 2023 systematic review of 10 RCTs with 437 participants documented consistent blood NAD+ elevation and no significant adverse events across that range. 250–500mg per day is the most commonly studied band. NMN has no established RDA. Consult a qualified healthcare professional for personalised guidance.
500mg is within the most commonly studied range, with consistent blood NAD+ elevation documented at that dose. Whether higher doses produce meaningfully greater effects is not established. Purity and independent batch testing matter more than whether you take 500mg or 600mg. See how to choose an NMN supplement →
1000mg per day sits above the 250–900mg range covered by the 2023 systematic review. One 4-week safety study (Fukamizu et al. 2022) used 1250mg per day in healthy adults without reporting safety concerns, but long-term data at that level is limited. Our NMN 1000mg Pure provides 1000mg per serving; our other three NMN formulas provide 500–750mg, inside the studied range. Consult a healthcare professional before using doses above the studied range. See NMN 500mg vs 1000mg →
Morning is the most common timing used in published human NMN studies. NAD+ plays a role in circadian rhythm regulation, which has led some researchers to suggest morning timing — but no published study has established morning as superior to evening. Consistency of timing matters more than which specific time you choose. See when to take NMN →
Published research has used both fasted and fed administration without establishing a clear advantage for either. If you experience digestive discomfort on an empty stomach, take NMN with food. Follow your product label guidance.
The 2023 systematic review documented no significant adverse events at 250–900mg per day. A 4-week safety study used 1250mg per day without reporting safety concerns. Long-term data at high doses is limited. Do not exceed the serving suggestion on your product label without consulting a healthcare professional.
Published human research has used daily continuous administration — not cycling. Study durations have ranged from 4 to 24 weeks of daily use. There is no published evidence establishing a benefit to cycling NMN.
Published human studies have measured endpoints at 4–12 weeks of daily supplementation, with blood NAD+ elevation documented within 2–4 weeks in some studies. Subjective experience varies between individuals. NMN has no authorised health claims — this describes what research has measured, not a promised outcome. See how long NMN takes to work →
NMN is widely sold in the UK, but its regulatory position is not settled. A GB novel food application for β-NMN (FSA reference RP-2116) is under assessment by the Food Standards Agency. In the EU, EFSA published a positive safety opinion on β-NMN in 2026; formal authorisation is still pending and would not bind Great Britain. No health claim is authorised for NMN in the UK or EU.
Four standard-NMN formulas: NMN + Trans-Resveratrol 1100mg (500mg NMN per serving), NMN + TMG (750mg), NMN Complete 1600mg (750mg) and NMN 1000mg Pure (1000mg). The first three sit inside the 250–900mg range studied in published human research; the 1000mg product sits above it. All UK manufactured and ISO/IEC 17025-tested every batch. CoA on request: info@vitality-supplements.co.uk
Shop NMN supplements
>99% β-NMN purity · ISO/IEC 17025 tested every batch · UK manufactured · CoA on request