When it comes to health and longevity, NMN, short for nicotinamide mononucleotide, is getting really popular these days mainly because of how it works deep inside the body at a cellular level. NMN supports the systems that actually create energy in the first place rather than acting like a quick energy boost such as caffeine. It does this by helping the body produce a molecule called NAD⁺ (nicotinamide adenine dinucleotide), which is essential for keeping our cells functioning properly.

NAD⁺ is involved in hundreds of processes, but one of its most important roles is helping turn the food we eat into usable energy. It also plays a key part in repairing damaged DNA, supporting brain function, and helping cells respond to stress. The challenge is that NAD⁺ levels naturally decline as we age. This drop is now considered one of the reasons why people often start to feel more fatigued, recover more slowly, and experience gradual changes in metabolism and overall vitality.

This is where NMN comes in. It acts as a building block that the body can convert into NAD⁺. By supplying more NMN, the idea is that we can help restore NAD⁺ levels and, in turn, support better energy production and cellular health. Think of it less like adding fuel to the tank, and more like improving the engine so it runs more efficiently.

A lot of the early research on NMN has been done in animals, where the results have been quite striking. Studies have shown improvements in energy metabolism, insulin sensitivity, physical activity, and even lifespan in some cases ⁽¹⁾. The study demonstrated that long-term (12-month) oral administration of NMN (nicotinamide mononucleotide) in mice mitigates age-associated physiological decline. The study found that NMN boosts NAD+ levels, suppresses age-associated weight gain, enhances energy metabolism, promotes physical activity, improves insulin sensitivity, and improves eye function without obvious toxicity.

Human research is still catching up, but it’s starting to build. Clinical trials have shown that NMN can reliably increase NAD⁺ levels in the body, which is an important first step ⁽²⁾. Some studies have also found improvements in muscle function, walking speed, and certain metabolic markers in middle-aged and older adults ⁽³⁾. These changes aren’t dramatic or immediate, but they suggest that NMN may support the body in maintaining function as it ages.

Another reason NMN is of interest is because of how it supports proteins called sirtuins. These are sometimes referred to as “longevity proteins” because they help control inflammation, repair cells, and protect against stress. Sirtuins rely on NAD⁺ to work properly, so when NAD⁺ levels drop, their activity also declines. By helping to restore NAD⁺, NMN may indirectly support these protective systems, which is why it’s often linked not just to energy, but also to brain health and healthy ageing overall.

In terms of safety, NMN appears to be well tolerated in the short term. Human studies using doses between 250 mg and 900 mg per day have not reported significant adverse effects in healthy individuals ⁽²⁾. However, long-term data is still limited, and not all supplements on the market are created equal, so quality and sourcing do matter.

It’s also important to keep expectations realistic. NMN is not a magic anti-ageing pill, and it won’t replace the basics of good health. Sleep, nutrition, movement, and stress management still have the biggest impact on how we feel and age. What NMN may offer is an additional layer of support, helping the body work more efficiently at a cellular level, especially as natural NAD⁺ levels decline over time.

For more information about NMN, drop into Go Vita, Your Health Shop at 5 North Street, Batemans Bay. You can also call us on (02) 4472 9737 or visit us online at www.govitabatemansbay.com.au. Don’t miss our weekly segment on 2EC radio, where Marianne and Go Vita's Nutritionist Sofia chat about health and wellness with Kimmi Saker every Wednesday after 12.30pm. 

References

1. Mills KF, Yoshida S, Stein LR, Grozio A, Kubota S, Sasaki Y, Redpath P, Migaud ME, Apte RS, Uchida K, Yoshino J, Imai SI. Long-Term Administration of Nicotinamide Mononucleotide Mitigates Age-Associated Physiological Decline in Mice. Cell Metab. 2016 Dec 13;24(6):795-806

2. Yi, L., Maier, A.B., Tao, R. et al. The efficacy and safety of β-nicotinamide mononucleotide (NMN) supplementation in healthy middle-aged adults: a randomized, multicenter, double-blind, placebo-controlled, parallel-group, dose-dependent clinical trial. GeroScience 45, 29–43 (2023).

3. Igarashi, M., Nakagawa-Nagahama, Y., Miura, M. et al. Chronic nicotinamide mononucleotide supplementation elevates blood nicotinamide adenine dinucleotide levels and alters muscle function in healthy older men. npj Aging 8, 5 (2022).

4. Imai S, Guarente L. NAD+ and sirtuins in aging and disease. Trends Cell Biol. 2014 Aug;24(8):464-71