Carrageenan, a multifunctional ingredient extracted from red algae that are harvested in the sea, commonly used as a gelling agent, thickener, stabilizer in food categories, like meat, jellies, ice creams, and puddings. The European food additive number for it is E407 and E407a (with cellulose content). Generally, it is safe, natural, vegan, halal, kosher and gluten free.

http://www.chinafooding.com/Carrageenan