Lactobacillus rhamnosus GG is the world's best documented strain of good bacteria. The special strain (GG) of bacteria is described in more than 750 scientific publications and has been subject to more than 250 clinical studies. Provides Lactobacillus rhamnosus GG at a clinically studied amount of 10 billion per capsule. Good gut bacteria species which are frequently found in food supplements include Lactobacillus and Bifidobacterium species.