What is evening primrose oil primrose oil is a popular plant extract obtained from the seeds of the evening primrose plant which contains the essential polyunsaturated fatty acid gla gamma linolenic acid why use evening primrose oil evening primrose oil is a premium quality soft gel containing 1000mg of evening primrose oil and providing 90mg gla and 10mg of vitamin e gla cannot be produced by the body and many people may find it difficult to consume enough from their diet therefore su