I am having some side effects from strontium citrate and am hoping for some advise. I started taking it a week ago 680 mg - 2 capsules together. Was having headaches and constipated. Stopped two days ago, symptoms cleared up within 2 days. I would like to try it again as I am afraid of the existing osteoporosis medications. Does anyone know if strontium is effective if I take 1 capsule two times a day, hoping that may help with side effects.