The alleged benefits of aromatherapy range from stress relief to enhancement of immunity and the unlocking of "emotions from past experiences." Many oils have proven antiseptic properties and can be used as first aid and as an ongoing treatment for cuts, burns, insect bites, and bruises. Some other oils are anti-inflammatory, anti-bacterial, and antibiotic, among many. Oils with anti-fungal properties can be used in such conditions as athlete’s foot and other fungal infections. Some can be used as an aid in the overall management of more serious conditions, such as candida, arthritis, and chronic pain.
A study published in the Headache Quarterly reported on the effects of inhaling green apple fragrance to reduce the severity of migraine headaches. The researchers theorized that since certain ambient odors reduce anxiety, green apple aroma may affect emotions positively in other contexts, helping to reduce the severity of migraine symptoms during an attack. Fifty patients were asked to rate the severity of their headaches at the onset and 10 minutes later during three separate headache episodes. The first and third episodes served as controls, but during the second headache episode, the subjects sniffed green apple fragrance from an inhaler. The resulting data indicated that green apple aroma may be useful as an adjuvant therapy in managing chronic headache.
In a study done in London, England, researchers studied the effects on brain wave patterns when essential oils are inhaled or smelled. They found that oils such as orange, jasmine, and rose have a sedative, tranquilizing effect and function by altering the brain waves into a rhythm that produces calmness. Furthermore, stimulating oils-basil, black pepper, rosemary, and cardamom-work by producing a heightened energy response.