Food allergies can be scary thing. Most of us that deal with any type of allergy look at ingredient labels closely but there are some ingredients that are not always listed in layman's terms. Below is an excerpt from a WebMD article that discusses this.  "However, food labels don't tell the whole story. Natural flavors like pineapple, milk casein, or hydrolyzed soy protein may be used in microwave popcorn, for example - yet you won't see them on the ingredient list. You'll see words like "flavoring" or "natural flavoring." Words like "emulsifier" or "binder" can also hide the fact that soy or egg is in the product. If you have a food allergy, it's important to get familiar with these types of terms.  While some products clearly list eggs or egg proteins as ingredients, others are less clear. If only tiny amounts of egg are in the product, you won't always see it on the label. Noodles may contain egg, but not list it as an ingredient. Processed meats, like sausages, often have egg hidden in the mix. Bagels, pretzels, and other baked goods get their shiny appearance from egg white - but it's not mentioned on the package label." The complete story also covers triggers, products and has a great list of each type of food and their allergy symptom.