This is an excellent gelatin source for vegetarians and can replace traditional gelatin in preparations like panna cotta or mousse. Carrageenan Iota (Calcium) is a fine white powder produced from a compound found in the iota species of red seaweed that is used as a food additive to suspend, emulsify, thicken, bind, and gel. Used to thicken liquids and stabilize foams and emulsions. It is cold soluble, fast setting, and freeze-thaw stable.