This is the easiest form of calcium to utilize if one has poor digestion due to excessively low stomach acid. Calcium and magnesium may be helpful for bone building and maintenance and as a nerve and muscle tonic. Suitable for vegetarians and vegans. Magnesium 500 Can be used for heart health and circulation, migraine, osteoporosis, PMS, poor sleep and cramp. Suitable for Vegetarians and Vegans. Magnesium may interact with some forms of medication