NAD+ is the fuel your body uses for everything — converting food into energy, keeping your brain sharp, repairing cells overnight while you sleep, and managing how your body responds to inflammation and stress. It powers all of them simultaneously.
The problem is biological and unavoidable. From your mid-30s, your body produces less and less NAD+ every year. By the time you're 50, you have roughly half the NAD+ you had at 25. That afternoon crash, the brain fog, the heavy mornings — these are some of the most common things people start noticing as NAD+ levels naturally decline.