Efamol Woman Pure Evening Primrose Oil 500mg with Rigel evening primrose oil unique to Efamol to support Beautifully smooth & nourished looking skin. Not all evening primrose oils are the same. Efamol's evening primrose oil is unique. It is extracted from a specially cultivated evening primrose oil, the seeds of which contain up to 33% more GLA than other oils. GLA is an Omega-6 nutrient found naturally in evening primrose oil. Reseach shows that it isn't just the quantity of GLA that's important - it's the quality. Efamol captures the essence of both.