We grade NMN D+ for worth-it at a typical cost of $30-60 per month. DRAFT: you are paying $40-80/month mostly for a biomarker increase with no proven outcome benefit yet.

What do experts say about NMN?

David Sinclair: Takes 1 gram of NMN every morning, as stated in his book Lifespan. Also covered: Charles Brenner, Andrew Huberman, Bryan Johnson.

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Supplement

NMN

The biomarker moves. The outcomes have not.

NMN (nicotinamide mononucleotide) is a precursor to NAD+, a molecule central to cellular energy metabolism that declines with age. We grade NMN C+ on evidence and D+ for worth-it at about $30-60 per month.

C+

Evidence

D+

Worth it

Typical cost: $30-60/month

What it does

NMN (nicotinamide mononucleotide) is a precursor to NAD+, a molecule central to cellular energy metabolism that declines with age. Raising NAD+ became one of longevity's biggest bets.

What the research says

Reliably raises blood NAD+ levels
Evidence: strong. Jan 2026 RCT (n=65): 1000 mg/day roughly doubled blood NAD+ in 14 days, comparable to NR. UTokyo trial (n=62, 65+, 1250 mg/day, 24 weeks, NPJ Aging): sustained NAD+ elevation across the trial.
May improve muscle insulin sensitivity in prediabetes
Evidence: emerging. 2022 trial: 250 mg/day for 10 weeks improved clamp-measured muscle insulin sensitivity 25% in overweight prediabetic postmenopausal women. Not replicated broadly.
No demonstrated effect on hard health outcomes yet
Evidence: moderate. UTokyo 24-week trial: no significant effect on hearing (primary), physical function, or other health outcomes despite NAD+ rise. 2026 meta-analysis (15 RCTs): safe and well tolerated, no broad metabolic benefits; slight diastolic BP dip and HOMA-IR trend only.

DRAFT: biomarker case (NAD+ elevation) is now strong across multiple RCTs, but the UTokyo 24-week trial found no health-outcome effects and the 2026 meta-analysis found no broad metabolic benefits. Biomarker strong, outcomes thin.

What the experts say

Every position links to its source. We include skeptics alongside supporters.

David Sinclair
Source, 2026-08-27 Takes 1 gram of NMN every morning, as stated in his book Lifespan.
Charles Brenner
“NMN doesn't get into cells as NMN. it gets in as NR and there's a safe source of NR so why are we still talking about NMN?”
Source, 2023-10-17 Argues NMN has far less human research and no known safe source, and that NMN enters cells as NR anyway, so NR is the better-supported choice.
Andrew Huberman
“I don't expect to live longer because of taking NAD. I just sort of like the effect that it appears to give me.”
Source, 2026-09-26 Takes NMN powder for a perceived energy effect but doubts it extends lifespan.
Bryan Johnson
Source, 2026-03-24 Takes 500 mg of NMN or NR six days a week to boost NAD+ for energy, DNA repair, and cellular health.

Is it worth it?

D+

DRAFT: you are paying $40-80/month mostly for a biomarker increase with no proven outcome benefit yet.

Typical cost

$30-60/month

Common form, not a brand recommendation

Dosage contextemerging

250 to 500 mg per day in published trials; no established long-term dosing.

Safety notes

Short-term trials report good tolerability, but long-term human safety data does not exist. Regulatory status has shifted over time; check current rules in your country. Talk to your doctor. This page is information, not medical advice.

Longevity Lab Report

NMN news, graded when it happens.

New studies, dose debates, and expert shifts on nmn, in one email a week. Free.

Changelog

Last updated 2026-10-15

2026-10-15|Seed entry created as DRAFT. Biomarker vs outcomes distinction is the whole story.
2026-10-15|Dosage context added.
2026-10-15|Goal tags added for the stack builder.
2026-10-15|Second pass: added Jan 2026 NAD+ RCT, UTokyo NPJ Aging 24-week outcomes (null), 2026 meta-analysis; grade C+ (biomarker strong, outcomes thin).