Evening Primrose Oil 1000mg Capsules contain Evening Primrose Oil (EPO), whichÊis a rich natural source of Gamma Linolenic Acid (GLA) essential for the production of Prostaglandins to help maintain and keep the body metabolism running smoothly and efficiently. EPO from HealthAid with added Vitamin E is cold pressed and hermetically sealed in a soft capsule to maintain freshness and purity.