Evening primrose is a plant native to North America. Evening primrose oil (EPO) has been the subject of hundreds of scientific studies, which led to it becoming one of the most widely used botanical medicines today. Clinical studies have focused on its use in treating problems associated with essential fatty acid (EFA) specifically GLA deficiency. Evening Primrose Oil is relatively high in essential fatty acids (EFAs), 7 – 10% of which is particularly gamma-linolenic acid (GLA). This high GLA of Evening Primrose Oil (EPO) helps to balance female hormones and thus treating Premenstrual syndrome symptoms (PMS) like problems associated with menstruation; Breast pain, Acne, Eczema & Nail problems.