Pete Hegseth wants widespread testosterone testing in the military. Researchers say US men already have a T problem.

The Department of Defense, under Defense Secretary Pete Hegseth, has introduced a policy to test testosterone levels in troops during annual check-ups, targeting older service members and allowing younger ones to opt in. Researchers criticize the policy, citing concerns over potential health risks for young servicemen and lack of evidence that testosterone treatment improves performance or longevity in men under 50.