May support a healthy immune system (As part of a balanced and healthy diet). Est.1986. As part of balanced and healthy diet (No significant difference has been shown between milk derived from rBST treated cows and non-rBST treated cows. The Lifeway Story: Since crafting the first batches of our Lifeway Kefir in 1986, we've been dedicated to producing the best tasting kefir and highest quality probiotic products. Today, we're proudly living American Dream and are excited to share the wonders of kefir and the joys of good health with your family - The Smolyansky Family.