Studies don't back this.
We reviewed the trials we hold for ageing markers. Nicotinamide mononucleotide's results were not strong enough to credit. NMN does raise NAD-related markers in your blood, but that's a lab number, not a health benefit. And it doesn't even reliably get where it's supposed to: in the key study blood NAD went up while muscle NAD didn't move. A rising NAD level is not evidence you're healthier or ageing slower.
See the evidence behind this answer in the complete report, including what was tested, the dose and preparation used, who took part, and funding information where available.
