Yes, you can absolutely add your favorite essential oils to Homemade Body Wash. You can add either a single essential oil or a blend. After you pour the homemade body wash into the container with the funnel, add 20 drops of essential oil per 4 oz. of homemade body wash. Shake the body wash to mix the oils in and let it sit for about 10 minutes. Check the scent after it sits and add more essential oils if you prefer. We don't do much with essential oils besides adding lavender essential oil to coconut oil for a soothing lotion, so you'll have to come up with your own blends.