Evening Primrose oil is a rich natural source of a polyunsaturated fatty acid called gamma linolenic acid (GLA) with multiple beneficial properties. GLA belongs to the family of essential omega- 6 polyunsaturated fats, which the body is unable to synthesize it on its own. Their daily dietary intake is therefore more than necessary. Linolenic acid is a form of omega-6 found in cooking oils, but a more desirable form of it is γ-linolenic acid (GLA), which is found in addition to evening primrose oil, black currant and vegetable oils. The body converts GLA into a group of substances called prostaglandins that play an important role in the body.