Evening Primrose Oil 500 Mg. For Centuries, Women of All Ages Have Depended On The Reliability of Evening Primrose Oil. Epo Contains One of The Richest Sources of Gamma-Linoleic Acid Gla – 45 Mg Per Serving, A Fatty Acid Not Commonly Found in Food. Popular With Women of All Ages, Epo Helps Provide Nutritional Support For Women With Pms. Royal Brittany’s Epo is The Best Product of Its Kind On The Market. The Epo Used For Royal Brittany is 100% Natural, Cold Pressed And is Void of Hexane And All Other Solvent Residue. Royal Brittany’s Epo Assures Quality, Reliability, And Purity.