Kefir (often searched as "kiefer food") is a fermented milk drink celebrated for its high probiotic content and "champagne-like" effervescence. You can find it at major grocery chains, specialty health food stores, and various online retailers.
Kefir is widely available in the dairy or health food sections of most supermarkets. Go to product viewer dialog for this item. Lifeway Plain Kefir kiefer food where to buy