Essential oils are natural or volatile oils derived from plants. These astringent, antibacterial, and highly concentrated oils vaporize easily in the air and release beneficial compounds that can help relax or stimulate the mind. Essential oils appear in a variety of natural products, including perfumes and colognes, soaps, massage oils, skin care products, food and drink, household cleaners, and aromatherapy. When applied topically in massage oils or bath products, essential oils can be therapeutic to the body by helping to relax muscles, alleviate soreness, or soothe skin. Topical application requires essential oils to be diluted with water or carrier oil to avoid skin irritation.