Our Evening Primrose carrier oils are ideal for diluting essential oils before using them on the skin. All of our base oils are 100% pure oil natural.Common Evening Primrose, sometimes known as Evening Star, is a common biennial plant in North America and other temperate countries. The plant is called Evening Primrose, since the flowers open completely at night and close again in the morning of the next day. Evening primrose oil is said to have many properties, among them are a number of positive effects for the skin such as helping with dandruff, eczema and psoriasis. Taken internally, it is also said to fight degenerative diseases, heart diseases and cholesterol.