Effects: Evening Primrose oil is found in the plant's seeds and is high in the essential fatty acid gamma - linolenic acid (GLA), Essential fatty acids - such as omega - 6, found in building blocks for a number of molecules in the body. Your body needs a balance of omega - 6 and omega - 3 fatty acids for good heath. Today, EPO is used to relieve to PMS symptoms and joint pain. There is evidence for EPO is for improving dryness and relieving itchness. Made In: USA