hormones

How Gregory Pincus, John Rock, Margaret Sanger, and Katharine McCormick created oral contraception — Enovid's 1960 FDA approval and its lasting effects.

How cortisol and the HPA axis work, why the daily cortisol rhythm matters, what chronic stress does to the body, and what the evidence says about cortisol.

What oxytocin does in the body and brain: childbirth, milk release, bonding, and trust, plus why the love hormone label and nasal sprays claim more than evidence shows.

How testosterone, estrogen, and progesterone shape the body, the menstrual cycle, puberty, and menopause — and the science of hormone therapy.

How hormones work: chemical messengers, receptors, feedback loops, key hormones such as insulin and cortisol, and the endocrine disorders that follow.