NAD+, NMN & NR explained

Why NAD+ matters

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme present in every cell, central to energy metabolism and DNA repair. NAD+ levels decline with age, which is why precursors that help the body make more of it have become popular.

Why you cannot just take NAD+

Oral NAD+ is large and unstable, and is largely broken down before it reaches your cells. That is why supplements use precursors the body converts into NAD+ instead.

NMN vs NR vs NA

Precursor	Notes
NMN (nicotinamide mononucleotide)	A direct NAD+ precursor; the most-studied in recent human trials.
NR (nicotinamide riboside)	A well-characterized precursor with strong bioavailability data.
NA / nicotinamide	Older forms; effective but with different tolerability profiles.

What the evidence says

Human trials of NMN at 250–900 mg/day have reported measurable increases in blood NAD+ levels over several weeks, with good tolerability. Evidence for downstream healthspan benefits in humans is still emerging — treat bold anti-aging claims with healthy skepticism.

Dosing & stacking

Most people use 250–1000 mg of NMN daily. Common companions: TMG (a methyl donor that supports methylation balance), trans-resveratrol, and CoQ10. See our NAD+ Booster and NMN 500mg.

Frequently asked

What is NMN?

A direct NAD+ precursor absorbed in the small intestine and converted to NAD+ in tissues.

NMN or NR — which is better?

Both raise NAD+. NMN has more recent human data; NR has a longer bioavailability track record. Either is reasonable.

Is NMN safe?

Human trials report good tolerability at typical doses. As always, talk to your clinician if you take medications or have a condition.

Sources

• Yoshino et al., NMN in humans, Science, 2021.
• Trammell et al., NR pharmacokinetics, Nature Communications, 2016.