Calcium is an essential macro element, for which you must pay special attention. Its priority function is mineralization and bone density improving, as well as keeping appropriate hardness of the teeth. But not only this. Calcium supplementation provides the correct permeability of cell membranes, the proper functioning of the nervous and muscle systems, which is especially important for people doing the training for improving the motor characteristics. Calcium is also the proper rhythm of the heart and providing the acid - alkaline balance. This macro element will also provide the release of neurotransmitters and the activation or suppression of various enzymes. Calcium taken together with magnesium can have relaxing properties. Supplementation should be properly planned as a large, single dose of calcium can impair the absorption of other minerals.