Probiotic. 10 + 2 Live & Active Kefir cultures - Lifeway's ProBoost. Real. No artificial growth hormones. 99% lactose free. Gluten free. Grade A. 10 + 2 Live & Active Kefir cultures - Lifeway's ProBoost: Lactobacillus reuteri; Bifidobacterium lactis; L. casei; L. lactis; L. acidophilus; L. plantarum; L. rhamnosus; B. bacterium longum; Leuconostoc cremoris; B. bacterium breve; S. diacetylactis; S. florentinus. The Power of ProBoost: No matter who you are or how busy your life, Lifeway Kefir provides you with the best nutrition in one delicious beverage. With Lifeway's essential 10 live and active Kefir cultures, plus Lifeway's exclusive new ProBoost, there's nothing better for your health. Lifeway's ProBoost contains lactobacillus reuteri and Bifidobacterium lactis; 2 powerful probiotic strains clinically shown to support digestive health and enhance immunity. Kefir - known as the champagne of diary, can be effervescent due to its unique probiotic strains. This is 100% normal. Look for a slightly rounded bottle. Rich in calcium. 99% lactose free. Certified gluten-free. Naturally cultured. Our Farmer's Pledge: We only use milk free from rBST and rBGH and is GMO free. No significant difference has been shown between milk derived from rBST/rBGH treated and non-rBST/rBGH treated cows.