How NAD+, the molecule your cells use to make energy and repair DNA, falls with age, and what NMN does to raise it.
The lab testing reported in this section was commissioned and paid for by the maker of one of the six products tested.
Explainer
Your cells repair their DNA with a molecule called NAD+, and your supply starts to drop around 25. In human trials, taking NMN brought it back up.
Report
In 2021, a test of 22 NMN supplements found 14 held almost none of the NMN on their labels. In September 2026, a lab measured 6 leading brands and found something very different.
The testing was commissioned and paid for by the maker of one of the six products tested.
Explainer
Your NAD+ peaked at 25. It has been falling ever since. In a clinical trial, NMN restored it to the age-25 peak level.
Buyer’s Guide
All 6 delivered at least 90% of the NMN on their labels. What differs is the dose each brand chose: one serving held anywhere from 260.7 mg of NMN to 1,139.6 mg.
The testing was commissioned and paid for by the maker of one of the six products tested.
IllustrationList
One molecule fuels your energy, your DNA repair and the enzymes science links to longer life. It begins to drop around 25, and taking NMN raises it again.
