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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.
If you have ever experienced an uncomfortable warmness, embarrassing redness and itching of your skin after taking niacin, you may want to try one of the many flush-free niacin supplements. These slow-release formulations are available in different amounts and in capsule, caplet, tablet and liquid form.