Testosterone is not just any drug. It’s not nitrous oxide out of a balloon at a Phish show or a little weed in a brownie. “T,” (as it is known) is, by most accounts, as close to a direct anti-aging medication as science has yet produced. It can be manufactured cheaply in large quantities, and the risks seem manageable for most people. Users report increased energy, more muscle mass, decreased body fat, greater sex drive, and a general sense of well-being. In short, it’s one of the most transformative substances a human can take.

“Testosterone is ridiculously powerful,” Campion says. “I can tell you from experience, the feeling of well-being, of focus, and of masculine energy are massively increased. It’s like you’re back to being 35.”

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