Essential oils are all extracted from plants, so they are also called plant essential oils. Plant essential oils are divided into single essential oil, compound essential oil and base oil. Unilateral essential oil is an essential oil extracted from a single plant, such as rose essential oil and jasmine essential oil. Compound essential oil is a mixture of single essential oil and base oil for a certain purpose, such as whitening and freckle removing essential oil and slimming essential oil. Base oil is used to be mixed with single essential oil (single essential oil is generally not used alone, except for a few varieties such as tea tree essential oil). There are many shops selling essential oils on Taobao. To avoid the suspicion of advertising, I still don't recommend them. The landlord can compare himself, including various factors such as price and brand. I wish you product satisfaction!