What Is NMN and Why Is Everyone Talking About It?
Nicotinamide mononucleotide (NMN) is a precursor to NAD+ — the coenzyme central to cellular energy production and DNA repair. As NAD+ levels decline with age (roughly 50% by age 50), supplementing precursors like NMN has become a major focus of longevity research. Harvard’s David Sinclair has been its most prominent advocate, though his own research is often cited more cautiously by other scientists.
What the Human Clinical Evidence Shows
As of 2026, several small human trials have completed. A 2021 study in Science found that 12 weeks of NMN supplementation in healthy older men improved muscle insulin sensitivity and physical performance. A 2022 Japanese trial showed increased NAD+ levels and improved walking speed in older adults. The findings are consistent but modest — we’re not yet at “extends human lifespan” territory.
NMN vs NR — Which Is Better?
NR (nicotinamide riboside) is the other major NAD+ precursor. Head-to-head human comparisons are limited. NMN is generally considered to raise NAD+ levels more effectively in muscle tissue; NR may have advantages in liver uptake. At practical supplement doses (250–500mg/day), the difference is likely small. Most longevity researchers use one or the other based on personal preference and cost.
Dosage, Safety and UK Products
Studies have used 250–1,250mg daily. Most UK supplement brands offer 250–500mg capsules. Short-term human safety data is reassuring. Long-term data is limited. Note: NMN is technically a novel food in the UK and requires FSA authorisation for sale — check brands are compliant. Price: £30–80/month for quality products.
⚕️ Disclaimer: NMN is not a licensed medicine. Consult your doctor before use, particularly if on medication or with a chronic health condition.