Lemon oil is uplifting and cleansing. It replaces negative emotions by creating a cheerful atmosphere of freshness and purity. It can help dispel mental fatigue and psychological heaviness. The aroma of lemon can inspire increased concentration and awareness. Lemon oil is powerfully astringent and antiseptic. Because it can cause skin irritation if used by sensitive individuals in dilutions exceeding 5%, it should not be applied undiluted to skin. Five drops or less of lemon oil should be added to a teaspoon of a carrier oil.