The unique balance of minerals in Gerolsteiner ensures bioavailability. The minerals are already dissolved, so your body can absorb them quickly. The ratio of minerals, especially calcium and magnesium, also enables maximum usage. In mineral water, the bioavailability of calcium is 84% and that of magnesium is 92%. As a comparison, in a banana, the bioavailability of calcium is only 38% and that of magnesium is a mere 29%.