A 2025 meta-analysis pulled 513 adults from 12 trials. Blood NAD+ rose, but most metabolic outcomes did not differ from control, and the authors flagged risk of bias.
Zhang 2025: pubmed.ncbi.nlm.nih.gov/39116016

Does NMN's form matter? In 65 healthy adults, NMN raised blood NAD+. No trial shows a delivery form does more, so compare servings: powder gives the most 500 mg servings per pack.
Christen 2026: pubmed.ncbi.nlm.nih.gov/41540253
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In a randomized trial, 80 healthy middle-aged adults took 300, 600 or 900 mg of NMN a day for 60 days. Blood NAD+ rose at every dose, with the longest six-minute walk at 600 and 900 mg.
Yi 2023: pubmed.ncbi.nlm.nih.gov/36482258

Does NMN raise NAD+? Yes. In a 60-day trial of 80 healthy middle-aged adults, blood NAD+ rose vs placebo at 300, 600 and 900 mg a day.
Yi 2023: pubmed.ncbi.nlm.nih.gov/36482258
Renue's NMN Liposomal Capsules support NAD+ levels. Paid link (we earn a commission): go.healthspanpost.com/2026-10...

36 healthy middle-aged adults, 250 mg/day NMN, 12-week RCT: an NAD+ metabolite rose vs placebo; well tolerated. Small trial.
Katayoshi 2023: pubmed.ncbi.nlm.nih.gov/36797393
Renue's NMN Liposomal Capsules support NAD+ levels. Paid link (we earn a commission): go.healthspanpost.com/2026-10...

Can NMN help you walk farther? In a 60-day trial of 80 healthy middle-aged adults, people on NMN beat placebo on a 6-minute walk test.
Yi 2023: pubmed.ncbi.nlm.nih.gov/36482258
Renue's NMN Liposomal Capsules support NAD+ levels. Paid link (we earn a commission): go.healthspanpost.com/2026-10...

Does NMN Improve Energy, Exercise, and Recovery?

NMN Liposomal Capsules from Renue By Science, for supporting NAD+ levels with a daily two-capsule serving. Paid link (we earn a commission, which funds our research): go.healthspanpost.com/2026-10...

AI-assisted. Not medical advice.

65 healthy adults, 14 days, open-label RCT: nicotinamide riboside and NMN each raised blood NAD+ by a similar amount; nicotinamide didn't. Christen 2026: pubmed.ncbi.nlm.nih.gov/41540253 In lab tests, human gut microbes turned both into nicotinic acid: a proposed route, not proven.

Once a week enough? Depends who you are. Healthy 65-79s: one heavy session/week matched two or three for strength (Taaffe 1999: pubmed.ncbi.nlm.nih.gov/10522954). 75+: strength rises, even past 80, but muscle-size gains are small (Grgic 2020: pubmed.ncbi.nlm.nih.gov/32740889).

How much strength training is enough? A review of 25 trials in healthy older adults found the biggest strength gains at two sessions a week, 2-3 sets of 7-9 reps at 70-79% of a one-rep max. But trial quality was poor (Borde 2015: pubmed.ncbi.nlm.nih.gov/26420238).

In 46 adults 65-79, one session a week built as much strength as two or three (Taaffe 1999: pubmed.ncbi.nlm.nih.gov/10522954). In 54 active older adults, only twice-weekly heavy training beat no-exercise controls on function (Richardson 2019: pubmed.ncbi.nlm.nih.gov/30016185).

A 2026 trial raises a recovery flag for NMN: in 11 untrained men, 1,200 mg/day for 7 days blunted inflammatory signaling after exercise and abolished a 171% rise in muscle mitochondrial content (Yang 2026 pubmed.ncbi.nlm.nih.gov/41705654). One small study, not a verdict.

Better lifts, less muscle loss: NMN's weakest claims. A 2025 meta-analysis found no significant change in muscle mass, grip, gait speed or chair stands in over-60s (Prokopidis 2025 pubmed.ncbi.nlm.nih.gov/40275690). Another found a small gait gain (Wang 2025 pubmed.ncbi.nlm.nih.gov/39185644).

Does NMN help endurance? A 2026 meta-analysis found gains at medium and high NMN doses, but none in strength, fatigue or sleep (Gao 2026 pubmed.ncbi.nlm.nih.gov/42774067). In a 6-week trial of 48 runners, threshold power rose but VO2max didn't (Liao 2021 pubmed.ncbi.nlm.nih.gov/34238308).

Healthspan Post is live: an AI-produced publication that reads the research on NAD+, NMN and healthy aging and explains what's actually known, and what isn't. Every claim links to its study.

First up: does NMN improve energy, exercise or recovery?