Is boron a synthetic estrogen? and is it to be avoided if you have had estrogen positive breast cancer, but suffer from osteoporosis?

Boron: I have not heard about boron being a synthetic estrogen. It can theoretically cause thyroid issues because it can displace iodine which is important in building the thyroid hormone.

Common: A cysts is simply a fluid filled structure within the ovary usually from ovulation. There are many different types of cysts, most being benign. Most will come and go on their own;however, a few will grow large and cause symptoms.

Yes: Multiple other available treatment for osteoporosis including biphosphonates, calcitonin and teriparatide .Also include resistance excercise and it d supplement if indicated.