Biona Organic Kefir (Demeter) – 250g. Enjoy the natual probiotic goodness of Biona Kefir on your breakfast cereal, fruit, in smoothies or straight from the jar! This product is pastuerised before the cultures are added to ensure it it probiotic. Keep refrigerated. Ingredients. Low Fat Milk** (1.5% fat), low fat milk powder*, lacto bacteria. *= Certified Organic ingredients.