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This photo provided by Eli Lilly & Co. shows the drug Axiron. Axiron, an underarm gel that rolls on like deodorant, is one drug used by men struggling with symptoms of growing older associated with low testosterone. Drugmakers and some doctors claim testosterone therapy can reverse signs of aging - even though the safety and effectiveness of such treatments is unclear.

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Testosterone marketing frenzy draws skepticism

Androgel is one of a growing number of prescription gels, patches and injections aimed at boosting the male hormone that begins to decline after about age 40. Drugmakers and some doctors claim testosterone therapy can reverse some of the signs of aging — even though the safety and effectiveness of such treatments is unclear.

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