Evening Primrose Oil is a recommended source of Gamma Linolenic Acid (GLA) and contains both Linoleic Acid (LA) and GLA. GLA is an omega-6 fat and a precursor of vital prostaglandins with important health benefits. Raising blood levels of GLA may help: protect the liver; maintain blood pressure within a normal range; contribute to heart health; promote healthy joint function; support normal cholesterol levels; and alleviate symptoms of premenstrual syndrome.