If you are prone to cancer, the
natural way is the only way to go,
estrogen makes cancer cells grow, the progesterone, does not.
Also, I recommend two very good books by Dr Lee, a pioneer in natural hormones and women's health. One is called "What you doctor may NOT tell you about menopause" and the other is called "What you doctor may NOT tell you about perimenopause" they are great books and easy to understand.