Taking aspirin, an NSAID painkiller, or an antihistamine can counteract some common side effects of niacin, reports WebMD. More serious side effects may require immediate medical attention, according to Drugs.com. More »

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Niacin supplements treat the lack of natural niacin production in the body, lower cholesterol, and decrease the risk of heart attacks in people who have already suffered them, reports Drugs.com. The FDA has approved niac... More »

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Flush-free niacin is marketed as an alternative to regular niacin, or vitamin B-3, supplements that can cause a flushing sensation or redness of the skin. These products have markedly reduced beneficial effects, accordin... More »

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Immediate-release niacin enters the bloodstream right away. Sustained-release niacin enters the bloodstream gradually. Both immediate-release and sustained-release niacin supplements are available over the counter in 201... More »

According to WebMD, niacin may improve cholesterol levels and in turn, lower the risk of cardiovascular disease. The vitamin is also known as vitamin B3 and is an essential vitamin for overall health. More »

If someone is allergic to aspirin, it is possible that they may have an allergic reaction to other nonsteroidal anti-inflammatory drugs such as Advil, explains Mayo Clinic. However, an allergy to aspirin does not necessa... More »

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Niacin, or vitamin B3, is one of the B-complex vitamins. Inositol nicotinate is a compound made of inositol and niacin that releases a form of niacin when metabolized by the body, helping to lower blood cholesterol and w... More »