What is the right dose of NMN or NR?

Human trials commonly use NR at about 250-500 mg/day or NMN at about 250-1000 mg/day. Both raise blood NAD+; the ideal dose for any specific outcome in healthy adults is not established.

Do NAD+ supplements actually work?

They reliably raise measured blood NAD+ levels. What is not established is whether that increase produces meaningful clinical benefits in healthy people — those downstream effects remain mostly unproven.

Can you just take NAD+ directly?

Plain oral NAD+ is poorly absorbed, which is why precursors like NR and NMN are used instead. Discuss any of these with a clinician, especially during pregnancy or cancer treatment.

NAD+ Supplements (NMN / NR) Dosage: How Much & How Often

NR ~250-500 mg/day or NMN ~250-1000 mg/day by mouth; both raise blood NAD+, but benefit in healthy adults is unproven.

Evidence-based answer

Oral NAD+ precursors are usually taken as nicotinamide riboside (NR) at about 250-500 mg per day or nicotinamide mononucleotide (NMN) around 250-1000 mg per day. Human trials show these raise blood NAD+ levels and are generally well tolerated, but clinical benefits in healthy adults remain mostly unproven. NAD+ itself is poorly absorbed orally.

Reviewed by Chad Waldman, Analytical Chemist · Last reviewed 2026-07-15

Dose by goal

Goal	Dose	Frequency	Evidence
NR (nicotinamide riboside)	250-500 mg	Once daily	moderate
NMN (nicotinamide mononucleotide)	250-1000 mg	Once daily	emerging
Plain 'NAD+' capsules	Poorly absorbed orally	n/a	limited

What the evidence shows

Controlled trials show oral NR raises blood NAD+ in a dose-dependent way and is well tolerated (PMID 29599478).
A placebo-controlled trial found NMN improved muscle insulin sensitivity in prediabetic women (PMID 33888596).

What it does not show

Increases in blood NAD+ have not reliably translated into measured clinical benefits in healthy adults.
Long-term safety and any anti-aging claims remain unproven.

Safety & cautions

Generally well tolerated in trials; mild GI effects possible.
Safety in pregnancy and during cancer treatment is not established — clear with a clinician.
Not a treatment for any condition.

Research citations

Martens CR, Denman BA, Mazzo MR, Armstrong ML, Reisdorph N, McQueen MB (2018). Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults. Nature Communications. PMID 29599478Oral NR raised blood NAD+ and was well tolerated in a placebo-controlled trial.
Yoshino M, Yoshino J, Kayser BD, Patti GJ, Franczyk MP, Mills KF (2021). Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Science. PMID 33888596A placebo-controlled trial found NMN improved muscle insulin sensitivity in prediabetic women.

Educational information only — not medical advice. Talk to a licensed clinician before starting any protocol.