NAD+ is a derivative of vitamin B3, which is involved in many functions of the body and plays a particularly important role in metabolism, DNA repair, gene expression and other processes. At the age of 25, the NAD+ level in the human body will reach the highest level, but with age, NAD+ will gradually decline, interfering with Sirtuin activity, and it will be accompanied by mitochondrial function slowdown, increased oxidative reaction, chronic inflammation, cognitive dysfunction and other problems. Ultimately destroys DNA. By taking NMN supplements, we can directly boost NAD+ levels in the body, which fuels sirtuins.