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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 known as vitamin B3, helps support general blood vessel and circulatory function.â  Nature Made Flush-Free Niacin 500 mg uses a type of niacin that does not have the side effects of flushing commonly associated with regular niacin supplements.*. Helps support general blood vessel and circulatory function.â .