Testosterone is having a moment. At once a molecular vector for toxic masculinity and a health-optimizing supplement for middle-aged tycoons eager to project vigor, “T” is perhaps the most discussed hormone around.

I blame Jeff Bezos, who has apparently aged in reverse since founding Amazon. After a tight-shirted appearance at the 2017 Sun Valley conference, his transformation from dweeby online-book-salesman to Vin Diesel-clone-with-alpha-swagger was unmistakable.