https://articles.mercola.com/sites/articles/archive/2021/10/15/nicotinamide-adenine-dinucleotide-benefits.aspx?ui=db1c8443091da8e5adafcb987fb464e0897952a7a94345dffa47df648a2295a5&;sd=20120913&cid_source=dnl&cid_medium=email&cid_content=art3HL&cid=20211015_HL2&mid=DM1019083&rid=1293202021

Several studies have proposed that mitochondrial dysfunction in your motor neurons drive the development of sarcopenia (age-related muscle loss)
Scientists recently discovered that Alzheimer's-like protein aggregates (amyloid beta) underlie the muscle deterioration commonly seen in aging, and that nicotinamide adenine dinucleotide (NAD+) is essential for combating this condition
When the NAD+ salvage pathways in muscle are impaired, mitochondrial dysfunction and decreased muscle mass ensue
NAD+ boosting molecules such as nicotinamide riboside (NR), nicotinamide mononucleotide (NMN), nicotinamide (a form of vitamin B3 or niacin) and nicotinic acid (niacin) have been shown to protect against age-related muscle disease
NMN appears to be the best, as it activates the NAD+ salvage pathway and is a direct precursor to NAD+. Lifestyle strategies such as exercise, sauna bathing, fasting, recalibrating your circadian rhythm and avoiding excessive EMFs and alcohol will also address low NAD+