Testosterone

SCIENCE

What Is Testosterone Replacement Therapy, and Is It Safe?

This episode was made possible by the support of Yakult and produced independently by Scientific American’s board of editors. Rachel…

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SCIENCE

Why Testosterone Therapy Could Harm Some Men, though It Could Help Others

Rob, 42, is a fitness guy. He loves working out, spends his spare time in the jujitsu gym and eats…

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