Evening primrose (Oenothera biennis) is a plant native to the Americas. Its yellow flowers open at sunset. The oil in its seeds contains omega-6 fatty acids.
Evening primrose oil contains gamma-linolenic acid (GLA). GLA is an omega-6 essential fatty acid that has anti-inflammatory effects in the body.
People use evening primrose oil for premenstrual syndrome (PMS), menopause symptoms, arthritis, high cholesterol, acne, and many other conditions, but there is no good scientific evidence to support these uses.
Don't confuse evening primrose oil with other plants or oils that are sources of GLA and omega-6 fatty acids, such as black currant, borage, and flaxseed oil.
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