Probiotic. Est. 1986. The Lifeway Story: In this bottle lives a 2000-year-old ancient healing recipe for kefir. Passed down for generations in Eastern Europe purely by word of mouth, it gained global fame after our family immigrated to the United States in 1976, where we shared the secret - the first batches of Lifeway Kefir were crafted in our basement in Chicago in 1986. And here we are. We love your guts, - The Smolyansky Family. We use milk that has not been treated with artificial hormones or antibiotics (No significant difference has been shown between milk derived from rBST treated cows and non-rBST treated cows). I'm Green Plastic: 100% biobased verified by ASTM D6866.