Here are some harmful ingredients that are commonly found in beer:

GMO Corn Syrup
GMO Corn
High Fructose Corn Syrup
Fish Bladder
Propylene Glycol
Monosodium Glutamate (MSG)
Natural Flavors
GMO Sugars
Caramel Coloring
Insect-Based Dyes
Carrageenan
BPA
& lots more!