80% of adults who take probiotics do not have any side effects. Generally, probiotics are very safe for human body and can have many good effects, helping to improve intestinal microecology, improve immunity, and also relieve some bloating and other problems. But probiotics also have its adverse reactions, some people after eating probiotics or after eating too much probiotics, there may be a short period of excessive intestinal gas, there may be abnormal intestinal peristalsis, so some patients may have constipation or diarrhea, or bloating and other adverse reactions, but these symptoms can be improved immediately after the discontinuation of probiotics. If the patient is a type of serious immune deficiency disease, probiotics should never be eaten, because for this type of patients probiotics will become pathogenic bacteria, but easy to cause infection. If you are allergic to probiotics probiotics can not be eaten, so most people probiotics are very safe, no side effects.