NAD+ stands for Nicotinamide Adenine Dinucleotide. It’s a crucial coenzyme which can be found in every cell of your body. It has two main functions: to turn nutrients into energy and it is an important part of the metabolic process. As we age, our body loses substances and molecules which is what kept us young. Along with the help of another molecule (NADH), both take part in creating energy within each cell. Also is a major factor in our sleep cycle, our circadian rhythm.