A typical marshmallow contains sugar, corn syrup, and gelatin, plus some air...
1. Gelatin: Boiled cow or pig skin, ligaments, tendons and bones
-- Gelatin, such as for jiggly, Cosby-promoted Jell-O, is a protein made with the skin, ligaments, tendons and bones of cows or pigs. It’s used in certain ice creams, marshmallows, puddings and Jell-O as a thickening agent. If you’re looking to not eat pig tendons in your pudding, try to find products that include agar agar instead; it’s vegan and made from seaweed.