Chocolate milk is sweetened, cocoa-flavored milk. It is created by mixing chocolate syrup (or chocolate powder) with milk (from cows, goats, soy, rice, etc.). It can be purchased pre-mixed or made at home with either cocoa powder and a sweetener (such as sugar or a sugar substitute), or with melted chocolate, chocolate syrup, or chocolate milk mix. Other ingredients, such as starch, salt, carrageenan, vanilla, or artificial flavoring are sometimes added. The carrageenan is used at very low concentrations to form an imperceptible weak gel that prevents the large, dense particles of chocolate from sedimentation. Like unflavored milk, chocolate milk should also be refrigerated. Chocolate milk was first created by Hans Sloane in Ireland during the late 1680s, and is generally served cold.