I am not an allergy mom, but I have lived in other countries.
If you have to ask, "Does this have peanuts in it?" don't buy it. Many people like to please the foreigner, so they will say whatever you want to hear, even if it means stretching the truth. I don't think they equate what they are doing with lying. It's just that they so want to accommodate you they will say anything. Beware.