Male hormone levels maintain day-to-day stability while female hormones experience continuous changes throughout both the menstrual cycle and various life stages.

In 1977, the US Food and Drug Administration (FDA) imposed a ban on women of childbearing age being included in early drug trials – even if they used contraception or had vasectomised partners. This ...

Female sex hormones estrogen and progesterone fluctuate monthly across the menstrual cycle, affecting moods and energy levels. New research from the University of Oregon finds that those fluctuations ...