It can be eaten for a long time, and NMN has no side effects and no dependence. Because NMN is an endogenous substance in human cells, the human body relies on nicotinic acid, tryptophan and nicotinamide in food nutrition to synthesize NMN through biochemical reaction every day. In terms of mechanism, NMN not only has no side effects on human body, but also is an essential substance for life activities. In the related research at home and abroad, there are no side effects even when the dose is many times higher than the normal dose. The first phase of clinical experiments in three foreign research institutions, including Harvard Medical School, proved that taking NMN is harmless to human body. American Glorylife)nmn is an enteric capsule developed by pure plant extraction technology, small molecular enzyme catalysis technology, SGS detection by a third-party authority, FDA filing certification and GMP certification. It is a good choice not to contain stimulants and hormones, which is green, safe and pollution-free.