Evening primrose oil. Woman holding an evening primrose oil capsule. Evening primrose oil is a popular dietary supplement. It contains a fatty acid which the body converts into hormone-like substances. These appear to decrease cholesterol levels, reduce inflammation and regulate the female reproductive system. Evening primrose oil is thought to help premenstrual tension, breast tenderness, alcoholism and eczema. Side effects are rare but the supplement should not be taken by epilepsy sufferers.
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