One of the most basic methods of applying essential oils is placing a few drops on the palm of one hand, then rubbing both hands together and inhaling the scent. Other ways include rubbing essential oil on the bottom of your feet, inside your wrists, forehead, and chest. Make sure to do a patch test first to make sure you won’t experience any allergic reactions. Apply 1 to 2 drops of essential oil to the inside of your wrist and wait 24 hours. After this time, if you don’t experience any negative effects, the oil is safe to use.