Don't rely on an OTC so - called «
hypoallergenic diet» to do a food trial because the purity of the ingredients usually can not be
guaranteed unless the food is manufactured on a dedicated line.
This is why as veterinarians, we often reach for the prescription
diets whether
hypoallergenic or a limited ingredient
diet, as they tend to have higher standards and cleaning practices to
guarantee their
diets are free from other protein contaminants.