What does adulterated essential oils mean?
Adulterating is adjusting or altering the oil in some way. It is a legitimate practice in perfumery and food processing to stretch or standardize the smell or taste of an oil. There are five different ways this is done. Stretching by adding alcohol, adding terpenes from another oil, adding a cheaper oil to an expensive oil (such as adding Lemongrass to Citronella), adding a colorless and odorless synthetic product, or by substituting an oil for another cheaper oil (such as Lavandin being sold as Lavender). These are all ways that essential oils can be adulterated.
