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Evening primrose oil (EPO) capsules are dietary supplements derived from the seeds of the evening primrose plant (Oenothera biennis), containing essential omega-6 fatty acids like gamma-linolenic acid (GLA). They are used to support hormonal balance, skin health, and to help manage symptoms of PMS and menopause, though scientific evidence for some benefits varies. The capsules often include added vitamin E to act as an antioxidant and improve stability.