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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 and nicotinic acid, is essential to good health. There are a plethora of niacin products to help you meet your specific nutritional needs. Niacin from brands like TwinLab and Nature's Bounty are available at Walgreens.com.