I am thrilled that I found this site, which is refreshingly devoid of drug company propaganda. This is my first post, and I sincerely thank the NOF for making this forum available! I am a breast cancer survivor (2011), and my tumor was ER positive. I have gone through surgical menopause and have been taking an aromatase inhibitor, though I'm currently on a 2-month vacation because of side effects. I am also have a degree in biochemistry and am nearly certified in holistic nutrition (had to take a leave due to a disability from my cancer treatment), so I feel comfortable with choosing appropriate supplements and following an alkaline diet. In the past I have taken a full spectrum of minerals for bone support, including boron. Most recently, after a DEXA scan showed one area of my spine had decreased in density to the "osteopenia category," I began taking AlgaeCal, which contains boron. As well as strengthening connective tissue in the bone matrix, boron plays a role in synthesizing estrogen. Because my tumor is ER+, I need to avoid pro-estrogenic substances. Should I be concerned about supplementing with boron? I'd be interested in hearing from Lara Pizzorno if she's willing to comment.