I have read the book about lifespan written by Prof David Sinclair and I had experienced in the use of NMN ( Nicotinamide mono nucleotide) for a limited time.
NMN is the precursor of NAD + and has the effect on cellular physiology and metabolism resulting in anti-aging processes especially in mouse models, however, in human clinical trials are under studied and investigations. Up to now , there are no reports about the obvious adverse events by the use of NMN (Song Q et al . Adv Nutri 2023 ) and it may have benefits in protecting the liver health especially in MASLD patients.