A guided tour through the strange science of hormones and the age-old quest to control them.

Metabolism, behavior, sleep, mood swings, the immune system, fighting, fleeing, puberty, and sex: these are just a few of the things our bodies control with hormones. Armed with a healthy dose of wit and curiosity, Randi Hutter Epstein takes us on a journey through the unusual history of these potent chemicals and their discovery, from the London laboratory where the concept of hormones was identified to a basement filled with jarred brains to a canine sex lab. We meet leading scientists who made life-changing discoveries about the hormone imbalances that ail us, as well as charlatans who used those discoveries to peddle false remedies. Along the way, Epstein examines the functions of hormones such as leptin, oxytocin, estrogen, and testosterone, demystifying the science of endocrinology.