There has been a lot of new research revealing that supplemental calcium causes plaque formation in blood vessels. This has created concern for those at risk for or having osteoporosis. While factors contributing to osteoporosis are much greater than calcium status alone, this research suggests that calcium supplementation may be helpful for women. As far as osteoporosis, please ensure good exercise, a whole food diet rich in vegetables, a balanced mineral supplement and adequate Vit. D, for starters.