Essential oils can be used in a variety of therapeutic ways. In addition, many essential oils are potent antibiotic agents. Aromatherapy can also be used to promote sleep, alleviate anxiety or pain, and improve mood. Although the psychological benefits of aromatherapy have been shown, the physiological benefits of essential oils, specifically their antibacterial effects, are still debatable.
Two classical essential oils are lavender and peppermint. Lavender is used to reduce stress and depression and promote relaxation; peppermint is used to treat headaches, digestive disorders, and muscle aches.
Source: Holistic and Complementary Tharapies