Rosemary Extract (Liquid), also known as Rosemary Oil Extract or ROE is an oil soluble, natural, stable (high temperature durable), non-toxic liquid and mainly used to retard rancidity in natural oils, it can also be added into the oil and fatty food, functional food, cosmetics and so on. Its potent antioxidant properties are attributed in large part to carnosic acid, one of its major constituents. Rosemary Extract (Liquid) is available with varying levels of carnosic acid, which is a kind of naturally occurring phenolic compound with antioxidant properties.