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beta
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NAD+

Trials used its precursors. Little benefit shown so far.

B

Grade B: Some human proof

Small, early or mixed results in people.

The grade is for the use people talk about, not for every use. Filed under: Health and wellness, over the counter.

How it works

A molecule every cell uses to turn food into energy. Levels fall with age.

How it was given in studies

By mouth. The trials used its building blocks, NMN and NR, as supplements.

This is what the studies did. It is not a how-to. Source: Review of 15 trials. Nutrients, 2026.

What studies saw

Most human trials used the precursors NR or NMN. A 2025 review of those trials found no gain in muscle or strength in older adults.

The trade-off

Swallowed NAD+ itself has little human data. Long-term effects are unknown.

When it showed up, in studies

First few weeks

Blood NAD+ rises within weeks on the precursors. A felt benefit is not established.

Sources

  1. Review of muscle trials
  2. Review of 15 trials
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Keep going

See how NAD+ mixes with others in the stack builder → Over-the-counter supplements: the claims, checked →

We show what studies found. We never tell you what to take. Doses vary by study. Check the sources and talk to a doctor.