American men are responding by attempting to increase their testosterone levels—whether they need to or not. Low-testosterone clinics, many of them based online, have proliferated, promising men a way to “get your spark back” or “reclaim your life.” So have supplements and accessories designed to support testosterone health—you can buy an ice pack designed specifically to keep testicles cool in a sauna. Recently, a friend who questioned his dedication to testicular health after seeing ads for testosterone boosters asked me if he should buy nontoxic briefs from a company called (yes, seriously) Nads.