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The therapeutic botanical properties of evening primrose oil (Oenothera biennis) are described as astringent and helpful for skin irritations. Incorporated into certain preparations at a 10 percent concentration, it appears to improve cases of pruritis and xerosis. evening primrose oil improves the skin’s hydration and its ability to develop normal barrier functions. evening primrose oil contains a high amount of gamma linoleic acid, which is one of the essential fatty acids vital for maintaining the normal functioning of the epithelial barrier membrane.