Vitamin B3 is a vitamin that includes three forms: nicotinamide (niacinamide), niacin (nicotinic acid), and nicotinamide riboside. All three forms of vitamin B3 are converted within the body to nicotinamide adenine dinucleotide (NAD). NAD is required for human life and people are unable to make it within their bodies without one of the vitamin B3 or tryptophan. The group is also occasionally referred to as vitamin B3complex. Niacin is obtained in the diet from a variety of whole and processed foods, with the highest contents in fortified packaged foods, tuna, some vegetable, and other animal sources. Supplemental niacin is primarily used to treat high blood cholesterol and pellagra (niacin deficiency). Not enough niacin can cause nausea, skin and mouth lesions, anemia, headaches, and tiredness.
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