My gynecologist had long ago recommended that I take a calcium supplement for my bones. I also read that calcium may prove beneficial for FMS(which I have). However whenever I take any calcium supplement or even drink something like calcium-fortified orange juice, I suffer from constipation. Constipation in turn triggers severe tightness of my back and hip muscles. Does anyone know of a calcium that will not cause constipation? I read through a few of the more recent posts with "calcium" in the message but none addressed this. What is coral calcium?