Evening primrose oil (EPO) is produced from the seeds of the evening primrose (Oenothera) family. The oil is high in fatty acids including the essential omega 6 linoleic acid and the non-essential omega 6 gamma linolenic acid (GLA). Healthy individuals can make GLA from linoleic acid. Due to illness or dietary deficiency this conversion may become impaired in some people. GLA is important in the production of prostaglandins, which acts in the vascular and immune systems as well as in muscles. Taking Nature’s Own EPO supplies the body with a source of preformed GLA, which is thought to be what makes EPO important for some people.