Nad stands for Nicotinamide adenine dinucleotide.
Nad is a enzyme found in all living cells. If you take Niacin which is associated with anti-aging effects then you will be happy to know that niacin is used to synthesize NAD in your body naturally.
Havard studies have found that NAD can help slow aging and even reverse it. They have found that as you get older your NAD levels decrease. When older mice with neural degenerative disease were given NAD they show signs of reversing the symptoms. What this means that you can increase your life span to live healthier lives.