The main role of probiotic powder is to promote the absorption and digestion of nutrients, assist in improving immunity, maintain the balance of intestinal flora, inhibit intestinal inflammation, and protect the intestinal mucosal barrier. 1. Promote the digestion and absorption of nutrients: probiotic powder can synthesize some digestive enzymes to participate in the digestion of intestinal substances, these digestive enzymes can decompose proteins, fats, carbohydrates in the intestinal tract, thus reducing the digestive burden of the intestinal tract. 2. Assist in improving immunity: some peptidoglycan and phospholipids on the surface of probiotic powder can be used as antigens to directly stimulate the body’s immune system, activate the immune response, and enhance the activity of the body’s intrinsic immune cells and natural killer cells, so as to achieve the role of enhancing immunity. 3. Maintain the balance of intestinal flora structure: The intestinal tract is a dynamic ecosystem, in which there are a variety of bacteria such as E. coli, staphylococcus. The participation of probiotic powder can maintain the ecological balance of complex intestinal flora, which is beneficial to health. 4. Inhibit intestinal inflammation: probiotic powder can relieve the inflammatory response of the body. 5. Protect the intestinal mucosal barrier: probiotics can reduce the intestinal mucosal permeability, thus protecting the integrity of the intestinal mucosal barrier. Healthy people do not need to use probiotic powder routinely, probiotic powder is mainly suitable for constipation and diarrhea people and indigestion. It is recommended to use probiotic powder under the guidance of a doctor.