Oestrogen therapy

I’ve had a bone density test every couple of years. Although my bone density was excellent when I started Letrozole, I too was found to have a low level of Vitamin D and had to raise it before starting chemo. I continue taking it and calcium, just like you. My breast surgeon recommended Ovestin three times a week, I felt safer with twice a week and now only use it once every couple of weeks, a maintenance level. It is a personal thing, in terms of your own confidence and comfort. Best wishes.