Trace elements in human and disease.and particularly calcium and magnesium,its necessary to take magnesium with calcium , Magnesium is needed for calcium absorption. Because magnesium suppresses parathyroid hormone and stimulates calcitonin, it helps deposit calcium into our bones, preventing osteoporosis. Without magnesium, calcium would become toxic, depositing itself in soft tissue, which can lead to arthritis.Therefore both cations are needed, how can we secure the ratio of calcium to magnesium ,