Science has shown that as we age our NAD+ levels quickly decrease. This is shown with decrease in energy levels, cellular metabolism, the body's ability to recover and heal correctly, and overall health. Increases in NAD+ levels are linked to more ability to repair DNA and SIRTUIN activity. It can also help support skeletal muscle, liver function, bone density, eye function, immune health, and energy levels. Higher energy levels that may come from an increase in NAD+ are associated with many benefits such as feeling younger, less genetic damage, heart health, SIRTUIN activation of longevity genes, and much more. NAD+ is a coenzyme found in all living cells and is needed for ATP production as well as cellular repair and overall maintenance. NAD+ helps to transfer energy from glucose and fatty acids to the mitochondria (the powerhouse of our cells), which will then convert that into ATP. By increasing the available pool of NAD+, more ATP can be produced. Anyone taking a NAC supplement should also be taking NMN due to the increase in ATP usage.