Hi Helen,
Hypothalamus and pituitary are responsible for stimulating production of many hormones. One type of estrogen is synthesized from cholesterol in the ovaries so maybe the liver could be a focus as well. You are dealing with probably the most complex system of hormones here.(just part of a larger system that is the most complex system of the body) If I remember anywhere nearly correctly at least half a dozen of them maybe more. Maybe focus on all of the organs that are involved in the endocrine system.
Walk in beauty,
Rebecca
