According to the Center for Science in the Public Interest, over one million people are allergic to substances commonly added to beer, wine, and liquor. Because the law does not require that ingredients be printed on alcoholic-beverage labels, most consumers don’t know, for example, which wines contain such additives as sulfur dioxide and which liqueurs contain coffee whiteners.

So what exactly is in your beer?

Some typical beer additives:

Ammonia caramel
Rhoiso-alpha acids
Sulphur dioxide
Propylene glycol alginate
Sodium benzoate