My advise for people who have primary care providers who manage their health care needs is "obtain advice from these providers before using probiotics. If a person is critically ill, probiotics could be harmful. For example, if a person is suffering from a condition called "acute pancreatitis" and consumes probiotic bacteria, this could increase this person's risk of dying.
If a person has allergies, probiotics could increase his or her risk for developing sensitivities to more allergens. There is some evidence that probiotic products such as yogurts may cause an increase in risk for obesity in some people. These theories are still being investigated and more time will be needed to know for sure if these findings are true. My suggestion is to refrain from over-doing it with the probiotics and to use your own doctor or other provider to help you with make good decisions on using these powerful organisms.
Regards, Dr. haddox