There are generally no side effects from taking probiotics. Less common side effects are increased stool frequency and possible allergies in some patients taking probiotics. Probiotics are beneficial active microorganisms that, by colonizing the body, change the flora composition of a certain part of the host. Probiotics are safe and no significant toxic side effects have been identified. The benefits of taking probiotics include promoting the digestion and absorption of nutrients, maintaining the structural balance of intestinal flora, protecting the intestinal mucosal barrier, and assisting in improving immunity. However, the use of medication needs to be cautious, so as to achieve scientific and reasonable use of probiotics, avoid excessive intake and supplementation of probiotics, otherwise it will disturb the intestinal environment. Rarely seen side effects are increased stool frequency and possible allergy in some children taking probiotics. For people with low immunity, constipation, diarrhea and indigestion, probiotics can be taken appropriately under the guidance of a doctor to improve symptoms.