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When it's used as a treatment to increase your HDL cholesterol or correct a vitamin deficiency, niacin is sold in higher doses that are prescribed by your doctor. Prescription-strength niacin includes such drugs as Niacor and Niaspan. Niacin is also available as an over-the-counter supplement.
niacin also called nicotinic acid is a b vitamin vitamin b3 used in vitamin supplements and in combination with prescription drugs it is most often used to prevent cardiovascular disease