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Kraut juice is a beverage that consists of the liquid in which sauerkraut is cured. It is the juice of the vegetable itself and the pickling brine. It is widely available in many central and eastern European countries, such as Germany and Kosovo, and in the parts of the Northeast and Midwest where German immigrants settled, such as central and western Pennsylvania. It may be taken as a dietary supplement, as it is a source of vitamin C, B vitamins, Vitamin E, Vitamin K, potassium (475 mg), calcium, phosphorus, sulphur, iron, copper, zinc, magnesium and lactic acid.

Source: Wikipedia