Kefir is a fermented dairy product that is gradually becoming more and more common on the shelves of Spanish shops and supermarkets. Since it is a milk-based product, made from lactic acid and alcoholic fermentation, it is assumed to have several health-enhancing functions resulting from its protein and peptide content with biological activity (molecules made up of amino acids, smaller than proteins, that are beneficial for one’s health).
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Source: Phys.org