Contains 25 billion Lab4 friendly bacteria per two capsules Each capsule also contains vitamins C and D3, calcium, zinc and selenium capsules can be stored at room temperature and the level of bacteria is guaranteed for the life of the product. Medications, eating habits and stress can all affect the balance of the good to bad bacteria in the gut. Lab4 comprises four separate strains of friendly bacteria (Lactobacillus acidophilus (CUL60), Lactobacillus acidophilus (CUL21), Bifidobacterium bifidum (CUL20) and Bifidobacterium animalis subsp. Lactis (CUL34)). Contains 25 billion Lab4 friendly bacteria per two capsules Each capsule also contains vitamins C and D3, calcium, zinc and selenium capsules can be stored at room temperature and the level of bacteria is guaranteed for the life of the product. Medications, eating habits and stress can all affect the balance of the good to bad bacteria in the gut. Lab4 comprises four separate strains of friendly bacteria (Lactobacillus acidophilus (CUL60), Lactobacillus acidophilus (CUL21), Bifidobacterium bifidum (CUL20) and Bifidobacterium animalis subsp. Lactis (CUL34)).