Approximately a billion people today are living with a hormone imbalance. Your hormones are responsible for a very large part of your total body health. Progesterone is the master female hormone and is known as the precursor or hormone from which many other steroid hormones are made, including estrogen and testosterone. To help you better understand your body, we’ve broken down some of the simple hormonal processes at different ages and the important role progesterone and estrogens play (both primary sex hormones for women) .