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Henry Taylor
Henry Taylor


Tea tree oil is available as an oil and in many over-the-counter skin products, including soaps and lotions. However, tea tree oil should not be taken orally. If swallowed, it can cause serious symptoms.


Tea tree oil, also known as melaleuca oil, is an essential oil with a fresh camphoraceous odor and a colour that ranges from pale yellow to nearly colourless and clear.[1] It is derived from the leaves of the tea tree, Melaleuca alternifolia, native to southeast Queensland and the northeast coast of New South Wales, Australia. The oil comprises many constituent chemicals and its composition changes if it is exposed to air and oxidizes.

As a traditional medicine, it is typically used as a topical medication in low concentrations for the treatment of skin conditions, but there is little evidence of efficacy.[3][4][5] Tea tree oil is claimed as useful for treating dandruff, acne, lice, herpes, insect bites, scabies, and skin fungal or bacterial infections.[4][5][6] However, there is not enough evidence to support any of these claims due to the limited amount of research conducted on the topic.[4][7] Tea tree oil is neither a patented product nor an approved drug in the United States,[5] although it is approved as a complementary medicine for aromatherapy in Australia.[8] It is poisonous if consumed by mouth, and unsafe to use on children.[9]

Tea tree oil has been used as a traditional herbal medicine in the belief it treats acne, nail fungus, or athlete's foot, with little evidence to support these uses.[4] A 2015 Cochrane systematic review for acne complementary therapies, found a low-quality single trial showed benefit compared to placebo.[10]

According to the Committee on Herbal Medicinal Products (CHMP) of the European Medicines Agency, traditional usage suggests that tea tree oil is a plausible treatment for "small superficial wounds, insect bites and small boils", that it may help reduce itching in minor cases of athlete's foot, and help with mild inflammation of the mouth lining. The CHMP say tea tree oil products should not be used on people under 12 years of age.[11]

Tea tree oil is not recommended for treating nail fungus as it is not effective.[12] It is not recommended for treating head lice in children because its effectiveness and safety has not been established and it could cause skin irritation or allergic reactions.[13][14] There is no good evidence tea tree oil is an effective treatment for demodex mite infestations.[15]

Tea tree oil is highly toxic when ingested.[4][16][7] It may cause drowsiness, confusion, hallucinations, coma, unsteadiness, weakness, vomiting, diarrhea, nausea, blood cell abnormalities, and severe rashes. It should be kept away from pets and children.[7] Tea tree oil should not be used in or around the mouth.[4][16][9]

Application of tea tree oil to the skin can cause an allergic reaction.[16] The potential for causing an allergic reaction increases as the oil ages and its chemical composition changes.[17] Adverse effects include skin irritation, allergic contact dermatitis, systemic contact dermatitis, linear immunoglobulin A disease, erythema multiforme-like reactions, and systemic hypersensitivity reactions.[6][18] Allergic reactions may be due to the various oxidation products that are formed by exposure of the oil to light and air.[18][19] Consequently, oxidized tea tree oil should not be used.[20]

In Australia, tea tree oil is one of the many essential oils causing poisoning, mostly of children. In the period 2014-2018, there were 749 reported cases in New South Wales, accounting for 17% of essential oil poisoning incidents.[21]

Tea tree oil potentially poses a risk for causing abnormal breast enlargement in men,[22][23] and pre-pubertal children.[24][25] A 2018 study by the National Institute of Environmental Health Sciences found four of the constituent chemicals (eucalyptol, 4-terpineol, dipentene and alpha-terpineol) are endocrine disruptors, raising concerns of potential environmental health impact from the oil.[26]

Tea tree oil is defined by the International Standard ISO 4730 ("Oil of Melaleuca, terpinen