NMN & NAD⁺: a reality check on longevity supplementation
NMN is celebrated as a big promise in the longevity scene. What lies behind the NAD⁺ molecule, what is actually proven in humans so far – and why caution is warranted when it comes to its legal status.
What it's all about: NAD⁺
NAD⁺ is a coenzyme found in every cell, involved in hundreds of reactions — most importantly in energy production within the mitochondria. It also serves as a building block for enzymes that repair DNA damage and regulate gene activity, including sirtuins and PARP enzymes.
The starting point of the whole debate is a lab finding: NAD⁺ levels in tissue decline with age. This gave rise to the idea of boosting them back up using precursors. NMN — nicotinamide mononucleotide — is one such precursor; NR — nicotinamide riboside — is another.
What the research in mice shows
In animal studies, the results are impressive. Rajman and colleagues compiled in 2018 what NAD⁺-raising substances do in mice: better insulin sensitivity, greater endurance, more favourable blood lipids – and in some mouse strains a delayed ageing process.
But that's also exactly where the problem lies. Mice aren't small humans, and in the field of ageing research countless substances have failed at this transition. Reading mouse data as evidence for humans is a mistake the research community itself doesn't make.
What is actually proven in humans
Yoshino and colleagues published the most well-known human study in 2021: twenty-five women with prediabetes, 250 milligrams of NMN daily for ten weeks. The result was improved insulin sensitivity in muscle tissue. No effect was found on body composition, blood pressure, blood lipids, or inflammatory markers.
That's a single, narrowly defined finding in a small and very specific group — not a statement about healthy people and not about ageing. For NR, the evidence base is somewhat broader: studies reliably show that NAD⁺ levels in the blood rise. What clinical benefit follows from that has not yet been demonstrated.
The legal status — and why it matters
NMN is not approved as a novel food in the European Union or in Switzerland. It therefore cannot be sold as a dietary supplement here. In the US, the FDA decided in 2022 that NMN cannot be marketed as a dietary supplement because it was previously investigated as a pharmaceutical drug.
Anyone who orders NMN online anyway is buying a product without regulatory review of purity, dosage, or labelling. Analyses have repeatedly found significant discrepancies between declared and actual content. That's not a legal technicality — it's a safety issue.
What actually influences NAD⁺ levels — according to the evidence
Three things provably raise NAD⁺ levels and cost nothing: physical exercise, which upregulates the enzymes responsible for NAD⁺ synthesis in muscle; fasting periods and a caloric deficit; and sufficient sleep, because NAD⁺ itself follows a daily rhythm.
Add to that sufficient vitamin B3 from your diet — niacin from meat, fish, peanuts, and whole grains is the classic precursor. Anyone thinking about expensive precursors before these basics are in place is starting at the wrong end. For pre-existing conditions or medications, any supplement should be discussed with a doctor — this content does not replace medical advice.
How the YUTHI app helps you
In the app you can log supplements with dose and duration and see them alongside what you're actually measuring — blood sugar, blood lipids, resting heart rate, recovery. Especially for something without solid data, that's the only way to answer the question: does it do anything for me?
Vito and Vita present the state of the research as it is — even if that means advising against a supplement. And they point out when the fundamentals are missing: without exercise and sleep, any NAD⁺ precursor is money wasted.
That was the snapshot. The app turns it into daily support.
Measure every day instead of calculating once: Vito or Vita puts your numbers in context, builds you a weekly plan and speaks up when something stands out.
Launching at the end of 2026 — iPhone first, Android to follow. Let me know when it’s out ↓
Sources
- Rajman L, Chwalek K, Sinclair DA. Therapeutic Potential of NAD-Boosting Molecules: The In Vivo Evidence. Cell Metab. 2018;27(3):529-547.
- Yoshino M, Yoshino J, Kayser BD, et al. Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Science. 2021;372(6547):1224-1229.
- Martens CR, Denman BA, Mazzo MR, et al. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults. Nat Commun. 2018;9(1):1286.
- Costford SR, Bajpeyi S, Pasarica M, et al. Skeletal muscle NAMPT is induced by exercise in humans. Am J Physiol Endocrinol Metab. 2010;298(1):E117-E126.