These oils come from nature ie. plant material and the oil is extracted out of each type of plant. There are steam distilled, chemically distilled either using hexane or another material to coax out the oils from the plant. Steam distilled generally costs more because this is the purest way to extract the oils from the plant. Essential oils come from all over the world. There are also absolute oils which are expensive and for good reason. They are highly concentrated and more potent then essential oils. In beauty products you only need a small amount of absolutes to have a fragrant product and most businesses reserve these for their leave-on products such as lotions, salves, oils, salts etc.