Doppelherz® aktiv Magnesium + Calcium + D3 Tablets supplies the body with essential nutrients for a greater resistance in times of physical or mental stress. An optimal supply with Magnesium is important for the production of energy for the cells. Magnesium is also involved in the activation of several enzymes. In addition it is necessary for the proper function of nerve and muscle cells. For the heart muscle in particular Magnesium is of great importance. Calcium is involved in many biological processes, e.g. blood coagulation. A good Calcium supply is also needed for healthy and strong bones. Vitamin D3 favours Calcium fixation in the bones. Vitamin D3 is produced by our own organism under the regular stimulation of sunlight on the skin. However Vitamin D3 synthesis in the skin may be reduced if the skin is naturally dark, if it is covered with clothes or protected with a sunscreen cream. Both Magnesium and Calcium are necessary for a normal muscular function and for the proper progress of several metabolic paths. Only one tablet of Doppelherz® aktiv Magnesium + Calcium + Vitamin D3 daily in complement of a balanced diet supplies an adequate amount of these two minerals which help to stay healthy and efficient in times of higher physical or mental stress.