Katherine Streeter for NPR

Study Shows Extra Testosterone Might Help Some Older Men

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Testosterone levels in men can go up and down throughout the day. Katherine Streeter for NPR hide caption

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Test First Before Going For Those Testosterone Supplements

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Katherine Streeter for NPR Katherine Streeter for NPR hide caption

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Testosterone, The Biggest Men's Health Craze Since Viagra, May Be Risky

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Some men take testosterone hoping to boost energy and libido, or to build strength. But at what risk? iStockphoto hide caption

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Prescriptions for testosterone medications, such as Testim and AndroGel, to men 40 and older rose threefold over the decade ending in 2011 MICHAEL BRYANT/MCT/Landov hide caption

toggle caption MICHAEL BRYANT/MCT/Landov