Award-winning Harvard physician,
author, speaker & magazine publisher


The Estrogen Window is the Ultimate Guide To Discovering What Every Woman Over 40 needs to know!

In this critically acclaimed best selling book, you will find out how to eliminate your confusion, calm your fears and get the help you need to be healthy, energized and hormonally balanced through easy to understand facts and tips like:

  • The safest time to take estrogen so you can lower the risk of breast cancer, heart disease, and dementia
  • How to minimize menopausal symptoms such as hot flashes, night sweats, mood swings, lower libido, fractured sleep, brain fog, irritability, and weight gain
  • Which estrogens and progestogens are safest
  • When it’s too late to take estrogen (hint – it’s different for each organ)
  • Essential things to know about bioidentical and compounded estrogens
    …and so much more
Dr. Mache Seibel has made a major contribution to women’s health in writing The Estrogen Window. As both a scientific expert on menopause and an expert in communicating to women, he has beautifully clarified the confusing topic of should women take estrogen as they go through menopause. Dr. Mache explains the data, and puts it into a perspective that will explain safe usage of the most effective therapy for menopausal symptoms. All women making choices on menopausal interventions will benefit from reading this book.
Mary Jane Minkin, MD, FACOG, NCMP

About Dr. Mache

Dr. Mache Seibel is a global leader in women’s wellness and menopause. He was a member of the Harvard Medical Faculty for 20 years and currently a Professor at the University of Massachusetts Medical School. Dr. Mache is Editor of The Hot Years: My Menopause Magazine, Creator of Menopause Breakthrough System, a five step proprietary system to help women in the hot years stay healthy, happy and hormonally balanced. Dr. Mache is recipient of multiple awards including Best Doctors in America and the Media Award from the North American Menopause Society. He has been featured in People magazine, Discover magazine, Today, MSNBC, hosted PBS specials and appeared on many other media outlets. He is also a frequent keynote speaker for numerous organizations, businesses, and conferences. Dr. Mache and his wife live in Boston, Massachusetts.

Connect with Dr. Mache —


Discover how much your menopause symptoms impact your health, your happiness and your life!