Rosemary essential oil is often used for alertness and stimulating memory. Dap a little into a handkerchief or cotton ball and inhale as needed. It can also keep you alert during long car trips or a long day at work. You Might Also Like Symphytum Officinale September 26, 2013 Hypnotherapy May 14, 2014 Lemongrass essential oil can be used to reduce pain March 9, 2015