Editor, Science of NAD
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Can NAD Prevent Gray Hair?
There are anecdotal reports, but no studies have looked at it...
A number of people have reported some of their gray hair returning to its original color after taking NR for months or years. I have even seen a "smoking gun" hair that was brown at the root, but gray at the tip. We have also seen control mice in anti-aging studies that seem to have less gray hair.
Interestingly, though, where the effect is reported, it appears to be only partial -- some hairs, but not all, return to their normal color.
This is, of course, a difficult study in humans, and no one appears to be attempting it, so we may not know for a long time.