These essential oil blends come pre-formulated directly from our supplier and were designed by professional aromatherapists. Unlike fragrances, E&S blends consist of only naturals. Unless otherwise noted, our blends do not contain carrier oils. They are concentrated blends of essential oils, CO2s, absolutes, etc. This allows our customers to have the greatest flexibility to use the blends in anything ranging from diffusers to finished products. It also allows the user to adjust the strength of the blend to suit his or her needs by simply mixing the blend with a carrier of choice, depending on the application and odor strength required.