Probiotic 225Compare to Pure Biotic Cleanse by Purely Integrative The GI tract is a finely balanced environment where roughly 500 different strains of bacteria compete for space and nutrients. When there is a healthy balance (eubiosis), few symptoms exist. However, dysbiosis can occur when an overabundance of potentially harmful organisms prevail. The natural microflora balance can become disrupted by medications (such as antibiotics, oral contraceptives, etc.),