My daughter has life threatening food allergies. I never buy any foods that aren't safe for her, including pet foods (since she handles the food). I started to put probiotics in the chicks' water and knew the ingredients, but hadn't checked for possible cross contamination. Important with people food since even traces of allergen can cause anaphylaxis so it would be important to us once eggs are being laid. So I emailed the company that makes the probiotics and they said that the item is made in a shared facility with at least one of my daughter's allergens (which happen to be peanuts and tree nuts) but that the eggs shouldn't be affected. Only the poo. What makes this different than say, soy or whatever, that people are concerned with getting into the eggs? Is it because it's a probiotic? Or are these people uninformed? The company that packages and sells it is not the same company that produces it, btw. The company that packages is the one that I am corresponding with, not the producers, but they got the information from the people who make it for them. And my other question-how else can I give them probiotics, if not this powder? I read that yogurt doesn't really have enough, but does it? Since chickens are so small and all? It needs to be a fairly easy method if possible since I don't really have the room, time or patience to make my own formula.