LYCOS RETRIEVER 
Niacin: Body
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Niacin is a member of the family of water soluble B complex vitamins. Niacin helps your body to use carbohydrates and fat efficiently, is important to maintain a healthy intestinal tract and for healthy skin.
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Niacin has the property of causing the small blood vessels to increase in size. These are the capillaries. Now, capillaries are often so small that the blood cells pass through them in single file. It is the capillaries that take care of the vast majority of all the cells in the body. You have large arteries near the heart, and they get smaller and smaller as they extend from the heart. But, at the end of every well-sized artery is a very large network of capillaries.
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Niacin functions in two important enzyme systems (NAD and NADP) that affect all the tissues of the body. These enzyme systems help transport hydrogen within the cell and make it available for biosynthesis. These two enzymes ... function closely with the energy molecule adenosine triphosphate (ATP).
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Niacin ... helps the body make various sex and stress-related hormones in the adrenal glands and other parts of the body. Niacin is effective in improving circulation and reducing cholesterol levels in the blood.
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Niacin supplements should not be taken by anyone on medication for high blood pressure, due to the potential for hypotension. Isoniazid, a drug used to treat tuberculosis, inhibits the body's ability to make niacin from tryptophan. Extra niacin may be required. Supplements may ... be needed by women taking oral contraceptives. Concomitant use of niacin with statin class drugs to lower cholesterol can cause myopathy. Cholestyramine and cholestipol, older medications to lower cholesterol, should be taken at a different time than niacin or they will reduce its absorption.
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Niacin is used to treat and prevent a lack of natural niacin in the body, and to lower cholesterol and triglycerides (types of fat) in the blood. It is ... used to lower the risk of heart attack in people with high cholesterol who have already had a heart attack. Niacin is sometimes used to treat coronary artery disease (also called atherosclerosis).
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