Base oil is a kind of vegetable oil used to dilute a single essential oil. Because pure essential oils is very irritating, direct rubbing on the skin will cause harm, so the essential oil must be diluted before being applied to the skin. Base oil is the first non-volatile oil extracted from seeds and fruits of various plants, which can be used as skin care oil and also as base oil for making massage oil. Plant base oil itself has curative effect. Vegetable oil is a good source of nutrition and energy. With it, the body can generate heat. It is an excellent source of protein. When we dilute essential oil with plant base oil, please refer to the suggestion of proportional use and buy compound essential oil directly. Although the price is more expensive, the curative effect will be much better than our own preparation. Essential oils are volatile and should be prepared in the dark. And it is not easy to grasp the proportion.