NMN is best known as a supplement that can increase NAD⁺-related molecules in the body.
But researchers are now asking a more practical question:
Can NMN actually help people maintain physical performance?
Recent human research suggests that it may have a positive effect on endurance.
That is promising. But it does not mean that NMN improves every aspect of physical fitness.
What Do Human Studies Show?
Researchers recently brought together evidence from 27 studies involving almost 1,600 adults.
They looked at several NAD⁺-related compounds and different aspects of physical and mental function.
When they examined endurance, NMN produced the clearest positive result.
People taking medium and higher doses of NMN generally performed better on endurance-related measures than those receiving placebo.
Lower doses did not show the same clear benefit.
This suggests that NMN may have a real effect on the body’s ability to sustain physical activity.
Does NMN Make You Stronger?
Not necessarily.
This is one of the most interesting findings.
When researchers looked specifically at muscle strength, they did not find convincing evidence that NMN improved it.
So endurance and strength need to be considered separately.
You might become better able to sustain an activity without necessarily becoming stronger.
Does Better Endurance Mean You Feel Less Tired?
Again, not necessarily.
The research did not show a clear reduction in how tired people said they felt.
This tells us something important about physical function.
What your body can do and how tired you feel are related, but they are not the same thing.
A person may perform better during an endurance test without experiencing a noticeable reduction in fatigue.
Why Does Endurance Matter as We Age?
Healthy aging is not only about avoiding disease.
It is also about maintaining the physical capacity to walk, exercise, travel, work and remain independent.
Endurance is part of this functional reserve.
That is why the NMN findings are interesting for longevity medicine. They suggest that the biological effects of NMN may, in some circumstances, translate into a measurable change in physical function.
Does This Mean NMN Slows Aging?
No.
The studies were generally short, and better performance on an endurance test does not prove that someone is biologically aging more slowly.
We still do not know whether NMN can preserve physical capacity over many years, prevent age-related decline or extend healthy lifespan.
What we can say today is more specific:
NMN has shown a promising effect on endurance in human studies.
That is clinically interesting — but it is not yet evidence that NMN slows aging.
Gallagher C, Emmanuel OO. NAD⁺ supplementation for anti-aging and wellness: A PRISMA-guided systematic review of preclinical and clinical evidence. Ageing Research Reviews. 2026.
