When asking the question Can NMN Reverse Grey Hair it's important to first ask, Why does hair turn gray? Well in this study it's perfectly demonstrated.
TLDR: When and how thoroughly your hair turns grey is influenced mostly by the genes you inherit from your parents. Though stress may play a role in the process.
NMN is a key precursor of nicotinamide adenine dinucleotide (NAD), a coenzyme that plays a vital role in cellular metabolism. NAD levels decline with age, and this has been linked to many age-related changes, including the greying of hair. Supplementing with NMN has been shown to increase NAD levels and reverse some of the effects of aging in animal studies. These findings suggest that NMN could potentially be used to treat grey hair in humans.
Although further research is needed to confirm the efficacy of NMN in humans, the available evidence suggests that this supplement could be a powerful tool in the fight against aging. If you're interested in trying NMN supplements, be sure to talk to your doctor first to see if it's right for you.
So maybe a better question to ask is...
Can NMN reduce GREY hair?
This is a complicated question, as the research is still ongoing and has yet to definitive answer. However, what we do know is that grey hair is caused by a lack of pigment in the hair follicle and that this process is reversible.
What's more, recent research has implicated specific proteins in the greying of hair, which are involved in mitochondrial and NAD+ functions.
This suggests that NMN, a precursor to NAD+, may be able to prevent or reverse grey hair. While more research is needed to confirm this, it is exciting to think that NMN may one day be used to restore our natural hair colour.