Melaleuca alternifolia or "tea tree" is a small tree native to the northeast coastal region of New South Wales, Australia. The leaves are the portion of the plant used medicinally. The medical world's first mention of tea tree appeared in the Medical Journal of Australia in 1930 where a surgeon in Sydney reported some impressive results when a solution of tea tree oil was used for cleaning surgical wounds. Tea tree oil has a broad range of antimicrobial activity. Although often provided in 100% strength, people with sensitive skin should use it in diluted form. It can be mixed with another oil such as almond oil. If a skin reaction occurs, discontinue use. It has been reported that allergic contact dermatitis to tea tree oil is commonly seen by Australian dermatologists [Medical Journal of Australia, February 21, 1994;160: p.236]. In addition, avoid contact with the eyes and remember to store any product out of the reach of children. Although one Naturopath is known to have swallowed an ounce of tea tree oil daily for thirty days and appeared to show no ill effects, it is generally recommended for external use only.

Tea tree oil has been used in the treatment of: acne, athlete's foot, boils, burns, carbuncles, impetigo, infections of the nail bed, insect bites, ringworm, and vaginal infections. Many products based on tea tree oil exist in the marketplace, including toothpastes, shampoos and conditioners, hand and body lotions, creams, soaps, gels, liniments, and nail polish removers. One study, however, concluded that tea tree oil should not be used on burn wounds. [Burns, 1997;23(4): pp.349-351]