Disclosure: I’m an authorised LifeWave Brand Partner with a financial interest in promoting LifeWave products. This article does not promote any NMN or NAD+ product. Full disclosure at the end.
A note before we start. This is general information, not medical advice. NMN’s regulatory status varies by country (it isn’t authorised as a food supplement in the EU), long-term safety data are limited, and product quality varies. Talk to your GP before taking it, especially if you have a medical condition, a history of cancer, or take medication.
NAD+ is a coenzyme in every cell, needed for energy production and DNA repair. Levels appear to fall with age, which has made NAD+ precursors like NMN and NR some of the most talked-about longevity supplements. The human evidence is still early.
Key takeaways
- NAD+ is essential for energy metabolism and DNA repair.
- NMN and NR raise NAD+ in blood in human trials.
- Effects on health outcomes in humans are small and inconsistent so far.
- There’s no evidence yet that they slow ageing in people.
- Exercise, sleep and diet remain the proven foundations.
What NAD+ does
NAD+ shuttles electrons in energy metabolism and is used by sirtuins and PARP enzymes involved in stress responses and DNA repair. Studies suggest levels fall with age, partly because of increased use by enzymes such as CD38.
NMN vs NR
Both are precursors that the body converts to NAD+. Oral NAD+ itself is poorly absorbed. Both NMN and NR raise blood NAD+ in human trials; neither has been shown to be clearly superior.
The human evidence
A 2021 trial in Science (Yoshino and colleagues) found 250mg of NMN a day for 10 weeks improved muscle insulin sensitivity in postmenopausal women with prediabetes. Other small trials have reported modest changes in walking speed, grip strength or fatigue in older adults, while several have found little effect. Most trials are small, short and sometimes industry-funded.
The pathways are interesting, and animal results are striking. But animal results often don’t translate, and there’s no human evidence yet that NMN or NR extend healthy lifespan.
What reliably raises NAD+-related pathways?
Exercise — both aerobic and resistance training — is the best-proven way to improve mitochondrial health. I lift every second day and walk 10,000+ steps daily.
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Join free →Frequently asked questions
Does NMN work in humans?
It raises NAD+ levels. Whether that translates into meaningful health benefits isn’t yet clear.
Is NMN the same as NAD+?
No. NMN is a precursor the body converts to NAD+.
Is it safe?
Short trials haven’t shown major problems, but long-term data are lacking. Check with your GP first.
Can I get NAD+ precursors from food?
Yes — vitamin B3 (niacin) from meat, fish, dairy and grains is converted to NAD+.
Related reading
Best Supplements for Longevity: An Honest Ranking · Mitochondria and Cellular Energy · Zone 2 Cardio
Full disclosure. This article is general information, not medical advice. These statements have not been evaluated by the FDA. As an authorised LifeWave Brand Partner I have a financial interest in promoting LifeWave products; this article does not concern any LifeWave product.
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