Knowledge · DoNotAge.org
NMN and NR: what selected human studies tell us
Different NAD+ precursors, different studies. Compare the questions and results without turning separate trials into a product ranking.
First published:
What the names mean
NMN stands for nicotinamide mononucleotide; NR stands for nicotinamide riboside. Both are discussed as precursors in NAD+ metabolism. A precursor is a starting material in the production of another molecule. Its biological role alone does not tell us what taking it will do for a person.
The useful comparison is therefore not simply which name sounds closer to NAD+. Ask which compound was tested, in whom, for how long and against what comparison. Keep each answer attached to its source rather than turning a collection of separate trials into a single competition.
What selected human studies measured
Martens and colleagues studied NR in a small placebo-controlled crossover trial in middle-aged and older adults. Six weeks of NR increased blood cellular NAD+ and was well tolerated at the tested dose. The study did not establish longer life.
Yoshino and colleagues tested NMN for ten weeks in postmenopausal women with prediabetes and overweight or obesity. Muscle insulin sensitivity improved after NMN; it did not change with placebo.
Dollerup and colleagues studied NR for twelve weeks in forty men with obesity. NR did not improve insulin sensitivity in that trial. This result matters when reading a summary that attributes an insulin-sensitivity benefit to that particular study.
| Trial | Compound | Keep this distinction |
|---|---|---|
| Martens · 2018 | NR | A NAD+ marker outcome |
| Yoshino · 2021 | NMN | A specific metabolic outcome |
| Dollerup · 2018 | NR | No insulin-sensitivity improvement |
Read beyond the headline
- Check the complete methods and the measured outcome, including results that did not change.
- Distinguish a planned main outcome from an exploratory analysis. Look for how missing observations and exclusions were handled.
- Read tolerability in context: a short trial at one dose is not comprehensive evidence about long-term use.
- Keep the source with the claim when sharing an article. A link to a study is useful only if the summary accurately reflects it.
Making sense of the comparison
This is a guide to reading a selected set of research, not an exhaustive review or an instruction to start a supplement. It deliberately gives no personal dose or product ranking. Your own circumstances are not reproduced by a trial summary.
Use the references to inspect the original research and the related primer to revisit the distinction between a biological explanation and evidence for an intervention. On the science hub, the two company-hosted DoNotAge® Routine reports have their own summaries and limitations.
