There are eight B vitamins including niacin, vitamin B3. It is water-soluble, which means your body does not store it. That way, your body can get rid of excess amounts of niacin if you don’t need that much. However, it also means you can develop a deficiency of vitamin B3. There are two forms of niacin including nicotinic acid and niacinamide. You can find both forms of food or supplements. However, your body also makes the vitamin from tryptophan, an amino acid.
Niacin can be applied to your skin topically or taken orally to help protect it from sun damage. Some people at high risk for skin cancer might be able to use nicotinamide to lower the chance of contracting non-melanoma cancer. Your doctor may recommend 500 milligrams of the vitamin twice per day.
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