Americans are injecting themselves with unregulated chemicals to boost their health. Is that safe?

While some research has shown benefits for patients who qualify, questions remain about the therapy's long-term risks and use among men without a medical need.

Defense Secretary Pete Hegseth says he's rolling out a new screening program for “testosterone deficiency” among troops.

Engineers have developed a new soft, flexible device that makes robots move by expanding and contracting -- just like a human muscle. To demonstrate their new device, called an actuator, the ...

Health officials serving under President Donald Trump want to make it easier for men to get a prescription for testosterone.

Eat 1.6-2.2 grams of protein per kilogram of your body weight daily to optimize muscle growth. Try pairing a high-protein diet with resistance training to build muscle. Animal sources of protein ...