Peter Attia· MD
nad is a molecule that's in our bodies we require every second of every day to exist our bodies use it for chemical reactions and without it everything shuts down and we're always making more and we're recycling it all the time we have many grams of it in our body it's probably one of the top two molecules that's important for life and one of the earliest that have ever evolved on the planet the other one is ATP which is chemical energy