Lemon oil is often used as a natural remedy to boost energy levels and combat exhaustion or tiredness. One way to use lemon oil for energy is through inhalation or diffusion. You can add a few drops of lemon oil to an aromatherapy diffuser or simply inhale the aroma directly from the bottle. The energizing scent of lemon has been known to provide a much-needed pick-me-up, promoting alertness, focus, and mental clarity. Some people also find that applying diluted lemon essential oil topically on pulse points can help rejuvenate and invigorate them throughout the day.