Calcium and magnesium are essential mineral elements for the organs; calcium helps to create and strengthen bones with vitamin ‘D’, while magnesium helps muscle function and stimulates the brain's senses. A deficiency or excess of magnesium has the same effect. Symptoms of a calcium deficiency: dry, itchy skin, nails that break, dry hair, cramps in the legs or back, etc. Programme ‘Hygiène et santé’ on Radio Don Bosco.