0You'll see essential oils in cosmetics, moisturizers, shampoos, and soaps. They can be found as part of air freshening systems and detergents as well. You'll even see them added to foods, or occasional sold in your regular grocery store as nutritional supplements. Use of essential oils, either aromatically, dermally, or internally, can be a highly effective, all natural way to achieve and maintain health; the same is true for your pets.