answer:Googling “what is aspirin made of” led to: “The compound from which the active ingredient in aspirin was first derived, salicylic acid, was found in the bark of a willow tree in 1763 by Reverend Edmund Stone of Chipping-Norton, England. (The bark from the willow tree—Salix Alba—contains high levels of salicin, the glycoside of salicylic acid.)” And this whole page about the making of aspirin . Looks pretty vegan as far as I looked – you can scour the info for yourself and check labels for specific brands. I see some chewables use lactose, which probably means an animal was milked for those.