Great news. Dr Jerilyn Prior is an expert on women’s hormones health, She studies women’s menstrual cycles, perimenopause and the causes for and treatment of osteoporosis. She has researched the use of the ovarian hormone progesterone for treatment of menstrual flow problems, hot flushes and low bone density. Her work showes that estrogen levels, besides being unpredictable, are significantly higher than normal in the perimenopause, the 3 to 10 years of changes before menopause. Her research has also shown an increase bone formation using progesterone.