I won't touch life threatening allergies and indicate that right on my profile. It's also in my contract. I will, however, take on the others. Sensitivities to eggs, dairy, wheat are fine.....a pain in the arse, but fine. There are some providers out there who take on life threatening allergies. I suspect, it's often because one of their own children has the allergy as well. I'm not sure how to go about finding them other than just asking in the initial email.