* Basil is used in perfumery for its clear, sweet and mildly spicy aroma. In aromatherapy, it is used for sharpening concentration, for its uplifting effect on depression, and to relieve headaches and migraines. Basil oil has many chemotypes and some are known to be emmenagogues and should be avoided during pregnancy.
* Bergamot is one of the most popular oils in perfumery. It is an excellent insect repellent and may be helpful for both the urinary tract and for the digestive tract. It is useful for skin conditions linked to stress, such as cold sores and chicken pox, especially when combined with eucalyptus oil. Bergamot is a flavoring agent in Earl Grey tea. Cold-pressed Bergamot oil contains bergaptene, a strong photosensitizer when applied to the skin, so only distilled or 'bergaptene-free' types can be topically used.
* Black pepper has a sharp and spicy aroma. Common uses include stimulating the circulation and for muscular aches and pains. Skin application is useful for bruises, since it stimulates the circulation.
* Citronella oil, obtained from a relative of lemongrass, is used as an insect repellent and in perfumery.
* Clove oil is a topical analgesic, especially useful in dentistry. It is also used an antiseptic, antispasmodic, carminative, and antiemetic.
* Eucalyptus oil is often used in combination with peppermint to provide relief for the airways in case of cold or flu.
* Geranium oil is used as an astringent, antiseptic and diuretic.
* Jasmine is used as an aphrodisiac.
* Lavender oil is used as an antiseptic, to soothe minor cuts and burns, to calm and relax, and to soothe headaches and migraines.
* Lemon oil is uplifting and anti-stress/anti-depressant. In a Japanese study, lemon essential oil in vapour form has been found to reduce stress in mice.
* Lemon oil - Researchers at Ohio State University reveals that Lemon oil aroma may enhance one's mood, and help with relaxation.
* Rose is used as an aphrodisiac.
* Sandalwood oil is used as an aphrodisiac.
* Tea tree oil and many other essential oils have topical (external) antimicrobial (i.e. antibacterial, antifungal, antiviral, or antiparasitic) activity and are used as antiseptics, disinfectants, and in mouthrinses.
* Yarrow oil is used to reduce joint inflammation and relieve cold and influenza symptoms.
* Ylang-ylang oil is used as an aphrodisiac.
Aromatherapy involves the use of distilled plant volatiles, a twentieth century innovation. The word "aromatherapy" was first used in the 1920s by French chemist René-Maurice Gattefossé, who devoted his life to researching the healing properties of essential oils after an accident in his perfume laboratory. In the accident, he set his arm on fire and thrust it into the nearest cold liquid, which happened to be a vat of NOx Ph232 or more commonly known as lavender oil. Immediately he noticed surprising pain relief, and instead of requiring the extended healing process he had experienced during recovery from previous burns—which caused redness, heat, inflammation, blisters, and scarring--this burn healed remarkably quickly, with minimal discomfort and no scarring. Jean Valnet continued the work of Gattefossé. During World War II Valnet used essential oils to treat gangrene in wounded soldiers.