The microbiota has an important role to play in digestion but also in immune defenses. The bacteria constituting the intestinal flora play a fundamental role in maintaining our balance. They are established in an ecosystem and produce substances beneficial for the proper functioning of the organism. They help in the degradation of certain absorbable substrate molecules, they protect against the proliferation of germs which could be harmful, they produce enzymes, vitamins and fuels of the cells of the large intestine. An imbalance of the intestinal flora can cause many disorders, bloating, diarrhea, vomiting, fatigue, weakened immunity ... It is then essential to recreate this flora using probiotics , which will work by strengthening the natural bacteria present in the body.