ROI is unlike any other mineral water, as it is the most magnesium-rich water in the world. Consuming the recommended daily allowance of .5L per day provided a multitude of significant health benefits to the consumer. As magnesium is responsible for the regulation of the overall nervous and muscular system, the most magnesium-rich mineral water in the world is the ideal companion to your rich lifestyle. Every drop of ROI Roitschocrene mineral water took 3400 years to come into being. This is the time the water travels through the layers of rock that enriches it with our unique concentration of minerals.