I just took a look at some ingredients beer CAN contain...
Irish moss seaweed of the species Chondrus crispus,
caramel, sequestering agent, acacia gum, aluminum silicate,
bentonite, calcium silicate, cellulose, China clay,
diatomaceous earth, isinglass, magnesium silicate,
Nylon 66, polyvinylpolypyrrolidone
silica gel and wood shavings derived from beech
ammonium persulphate, dimethylpolysiloxane, hydrogen peroxide