NAD+ supplement is a product that can help you improve your brain function and mental performance. NAD+ supplement delivers NAD+ to your brain cells, which is a coenzyme that is essential for the production of ATP, the main source of energy for the cells. NAD+ also helps repair the DNA damage and oxidative stress that occur in the brain due to aging, stress, or environmental factors. NAD+ supplement may help enhance your memory, learning, focus, and mood.