Tea tree oil is the essential oil distilled from Melaleuca alternifolia, a plant native to Australia. It has been used in traditional medicine for its antiseptic and anti-inflammatory properties to treat various skin conditions and infections. It is also a popular ingredient in skin and hair products. In lab studies, tea tree oil killed several bacteria and fungi most commonly found in skin infections and acne.
Studies on the use of tea tree oil in humans are limited. In healthy volunteers, a topical tea tree oil extract reduced inflammation caused by histamine exposure. It has also shown some benefit in individuals with athlete’s foot, acne, cold sores, and warts, but more studies are needed.