Evening Primrose Oil (EPO) contains the essential fatty acids gamma-linolenic acid (GLA) and linoleic acid (LA) and influences prostaglandin activity leading to a reduction of cramping pain and other symptoms associated with premenstrual syndrome, including cyclic mastalgia. Lifestyle factors such as excess saturated fats in the diet, ongoing high stress levels, alcohol consumption, and smoking may all affect GLA metabolism, leading to the need for dietary supplementation.
Other uses for EPO include relief of symptoms of rheumatism and arthritis as well as psoriasis and atopic eczema.