Potassium, calcium, magnesium The dietary supplement, consisting of potassium for the normal function of the nervous system, magnesium, which contributes to electrolyte balance, and calcium for normal energy metabolism, provides an extra boost of: feeling good, feeling fitter, feeling more efficient. Especially in situations of increased stress, Zentramin is an effective aid for general well-being. Application: Take 3 x 2 tablets daily with sufficient liquid.