Nicotinamide adenine dinucleotide is a cofactor that is central to metabolism. Found in all living cells, NAD is called a dinucleotide because it consists of two nucleotides joined through their phosphategroups. One nucleotide contains an adenine nucleobase and the other nicotinamide. NAD exists in twoforms: an oxidized and reduced form, abbreviated as NAD+ and NADH respectively.
 
Sources
NAD Animal Sources:
• Chicken
• Tuna
• Salmon
• Beef
NAD Plant Sources:
• Peanuts
• Avocado
• Barley
• Mushrooms
There is also Artificial Sources like Nicotinamide adenine dinucleotide (NAD) Supplements and medicinal items available in Healthcare and fitness Stores.

Function:
NAD is useful for various life processes which are responsible for the proper maintenance and functioning of the body. Basically, it is used to generate energy in the body and to guard against many diseases. Some of the uses of NAD are
1.Nicotinamide adenine dinucleotide (NAD) for Skincare: Being the highest coenzyme in metabolic process and the ability to repair damaged cells make NAD the most potent antioxidant. It helps in reducing the signs of aging and works as an essential element in skin care and provides energy to the aged and dead cells. NAD bears top position in the category of anti-aging elements. It repairs the damaged cells and increases their lifespan.
2.NAD in Cellular Respiration: NAD Supplement is an important enzyme in generating (Adenosine triphosphate) ATP which is the most important part of cellular respiration. Every cell in the body needs thousands of units of ATP and Nicotinamide adenine dinucleotide(NAD) helps in attaining this resource for the cells.
3.NADH in Supplements: There are many supplements available in the market containing NADH because it helps in repairing of damaged DNA and cells by promoting the growth of hormones and other useful elements in process of growth.

Application Area:
1. Diagnostic reagents raw materials, scientific research experiments.
2. Health food, cosmetic, feed additive
3. API production