These Medical sites are legit sources for correct, factual information:

American Academy of Allergy, Asthma, and Immunology (AAAI)

Daily Med (FDA site where you can find any package insert)

 Food & Drug Administration  (FDA)

Food Allergy Research and Education  (FARE)

Food Allergy & Anaphylaxis Connection Team (FAACT)

Kids with Food Allergies (A Division of the Allergy & Asthma Foundation of America)