Live & active probiotics. Est. 1986. Probiotics for immune system support (as part of a balanced and healthy diet). What is Kefir? Kefir, known as the champagne of dairy, has been enjoyed for over 2000 years. The probiotic cultures found in this bottle may help support immunity and healthy digestion and have contributed to the extensive folklore surrounding this beverage. Referred to in ancient texts, Kefir is more than a probiotic superfood; Kefir is a storied historic artifact.