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What are Hormones?
Hormones are the chemical messengers of the body, manufactured and controlled by the endocrine system. There are many different hormones with many different functions in the body, from water retention to controlling blood-glucose levels to instigating secondary sexual characteristics such as breast and beard growth.
The hormones that are of particular concern for transsexual people are estrogen, progesterone, and testosterone. Proportionally, biologic females have more estrogen and progesterone than males; biologic males have more testosterone.