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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 is a water-soluble B vitamin vitamin B3 - and the common name for 2 very different compounds: nicotinic acid and niacinamide. High doses of niacin (as nicotinic acid) can lower cholesterol levels (although the exact mechanism of action is still not known).owever, niacin is also made in the form of niacinamide-a form of vitamin B3 which, deliberately, is manufactured so that it will NOT cause dilation of the blood vessels-the flush so well known when using plain niacin.