Now Evening Primrose Oil 500 mg Softgel contains an omega 6 fatty acid that may help in immune response and to maintain normal skin barrier function, as well as a healthy vascular system. NOW Evening Primrose Oil has naturally occurring Gamma Linolenic Acid (GLA), an Omega-6 fatty acid also found in Borage and Black Currant Seed Oils. Although the body can synthesize GLA from other dietary fats, it can be more efficiently utilized for bodily functions when consumed in its preformed state. By supporting the body's healthy immune system responses, GLA may help to maintain normal skin barrier function, as well as a healthy vascular system. It may also be used as nutritional support for mild discomfort associated with premenstrual syndrome (PMS). Evening primrose oil helps support hormonal balance and has been found to be effective at reducing menstrual cramping, bloat, water retention, breast tenderness and irritability due to hormonal shifts during a women's cycle.