I have such ridiculously thick hair, my hair dresser said not to take biotin and told me I'm not thinning at all. I went for a second opinion for chances of endometrial cancer and ob/gyn said he did not see anything but sent a bunch of slides to lab. He said many women have hysterectomies but felt I'm doing fine with just having sore knee bones and gaining 10 lbs the last two years. It's been interesting, I had another abnormal mammo, then biopsy and it was benign, so tamoxifin is working!! Just please keep up with vitamin d-3, it's important to stay in the high numbers.