Milk Kefir Grains aka Bulgaros Pajaritos Lebanese Grains Tibetan Mushroom Mexican Mushroom, Live Active Probiotics Culture Starter.

Kefir or kephir (/kəˈfɪər/ kə-FEER), is a fermented milk drink similar to a thin yogurt that is made from kefir grains, a specific type of mesophilic symbiotic culture.