Thompson's E.P.O. 1000mg 300 caps Native Americans have long valued the Evening Primrose plant for its healing powers. Scientific research focuses on the therapeutic effect of the oil obtained from its seeds, which contain an omega-6 essential fatty acid called gamma-linolenic acid (GLA). Essential fatty acids (EFA's) such as GLA are utilised by the body to make up our basic cellular structure and to form the myelin sheath that insulates nerve cells and ensures the transmission of information to vital organs. EFA's are part of the mitochondria, the cell 'battery' that fules and energises the body, they also supply the precursors to the 'good' prostaglandins, which help to reduce inflammation and prevent blood clotting.