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The FA has continued to allow biological males to compete in the women's game if they show low enough testosterone levels and they are assessed by a match observer.

There are all sorts of differences between male and female kidneys, from the impact of testosterone to the biological effects of behavioral differences resulting from gender roles.

"Could Trump's tariffs be the ultimate testosterone boost?" declared Greg Gutfeld on "The Five," immediately answering the question with a "yes."

Those treatments corresponded to a pet theory of the Geiers that autism stemmed from the interaction of mercury in thimerosal with testosterone, and therefore that reducing testosterone would address autism.

The current rules for DSD athletes, meanwhile, require them to reduce their testosterone levels below 2.5 nmol/L for at least six months to compete in any female category event internationally.