Pet Flora is a Soil Based Organism. Have you ever seen your pet eat grass, pulling at the roots? This behavior is your Pet treating themselves with SBOs. Vitality Science takes the Soil Based Probiotics and then adds Humic and Fulvic acids, extracted from ancient plant deposits. Some other Probiotics are cultivated from non organic dairy which is less effective and may even cause more problems for aminals that are lacto-intolerant. Every cat and dog is subject to a multitude of stresses throughout the day, including; travel, boarding, separation anxiety, sickness, eating different foods and objects or processed food. All of these factors can contribute to an imbalance of "friendly" and "unfriendly bacteria." It is especially important to give your pet Pet Flora after taking antibiotics. Antibiotics are designed to kill bacteria that causes infections, unfortunately they also kill the "friendly bacteria." Pet flora Works fast to replenish the microflora and restore balance in your pet"s gut, then promotes and maintains a healthy intestinal tract. Unless you are dealing with a chronic imbalance, a few double doses will quickly resolve most GI upset.