Vitamin E has been associated with increased risk of death in some studies, but it may also delay cognitive decline in Alzheimer's disease. iStockphoto hide caption

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Timothy Webb and other advocates protest the cost of HIV drugs manufactured by the pharmaceutical company Gilead outside an AIDS conference in Atlanta in March. Gilead is making a new hepatitis C drug, Sovaldi. John Amis/AP Images for AIDS Healthcare Foundation hide caption

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A technique called optogenetics is being used in the laboratory to observe and control what brain circuits are doing in real time. Henning Dalhoff/Getty Images/Science Photo Library RM hide caption

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Knee pain is common, but surgery isn't necessarily the answer, researchers say. Inna Jacquemin/iStockphoto hide caption

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Martine Rothblatt, CEO of United Therapeutics, is the namesake of the company's latest drug, Orenitram. Ron Levine/Getty Images hide caption

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Vera Wojtesta was one of 300 babies flagged by New York's newborn screening program as at risk of having life-threatening Krabbe disease. Ben Shutts/Courtesy of the Wojtesta family hide caption

itoggle caption Ben Shutts/Courtesy of the Wojtesta family

Some people with only slightly elevated blood pressure might be able to relax a bit, if they're doctors go along new treatment guidelines. iStockphoto hide caption

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British pharmaceuticals giant GlaxoSmithKline is pledging to revamp its relationships with doctors. Sang Tan/AP hide caption

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Though some people might need more of specific vitamins, multivitamins don't help most people, studies say. iStockphoto hide caption

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Before you have get a new hip, you might want to check the government's list of best and worst hospitals for the operation. iStockphoto hide caption

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A simulated patient at the University of Malaya makes use of different materials to mimic the look and feel of human tissue. /Courtesy of Vicknes Waran hide caption

itoggle caption /Courtesy of Vicknes Waran