FISH BLADDER
Isinglass is the name, but fish guts are the game, and it is what they’re using when brewers make their beer. It is a gelatinous substance, and it is what they use to filter solids in the beer-making process.
There is no actual fish bladder in your beer right now if that is what you are worried over. Isinglass is put in the tanks usually when transferring from the first to the second fermentation process.
Brewers have had a ton of grief from the vegan community for this one, so some have replaced it with bentonite, which is a clay-settling agent that is vegan.
