It might not be an allergy. Probiotic yogurt is created to move your digestive system, soft the stools and assist in not getting constipated. If you have no issues with your digestive system and are already regular and soft then adding the probiotic yogurt is like adding a stool softener to your system. But even if you were allergic to it, it would not mean there was something wrong with you. It would be the same as someone who is allergic to milk or peanuts.