I feel it is important that ALL allergens be listed on food labels. As someone with a fatally severe allergy to mango (of all things), I have had my throat begin to close simply because "artificial and natural flavors" has included mango essence. A mango allergy is just an example of the many unique, obscure food allergies that have begun to develop as our regular food sources are expanded upon. Doctors have told me that a mango allergy - again used as a specific example - is becoming more and more common, partially because it is used in everything from candy to salsa to cocktails, without being mentioned in specific.
For the safety of myself and other Americans with food allergies, I petition that it be mandated by law that ALL allergens be listed on food labels.