Evening Primrose Oil enhanced with Berberis Aquifolium in 6X, also known as Evening Star is a Biennial plant common to North America and other temperate countries. The plant is named Evening Primrose as the flowers open fully at night and close up again through the morning of the next day. It has a thick consistency that is absorbed into the skin very slowly. Very useful during menopause as a reliever of hives and sweaty skin.