Evening Primrose Oil is an essential fatty acid containing gamma linolenic oil. Gamma Linoleic oil is an unsaturated fatty acid that helps to produce hormone-like substance. Evening Primrose oil is a good source and well known as food supplement since the 1980’s. It is known for treatment of premenstrual stress syndrome or PMS, multiple sclerosis, eczema, acne, rheumatoid arthritis and lowering the blood pressure level. Evening Primrose Oil is required by our body for growth and development.