Glossary
An essential oil distilled from the leaves of the Australian tea tree (Melaleuca alternifolia). Tea tree oil is one of the most widely studied antimicrobial essential oils, used primarily for acne treatment, minor wound antisepsis, and fungal skin infections.
Australian Aboriginal peoples used tea tree leaves medicinally for thousands of years. Modern research has validated their instincts: tea tree oil demonstrates significant antibacterial, antifungal, antiviral, and anti-inflammatory activity in laboratory and clinical studies. The primary active compounds, terpinen-4-ol and 1,8-cineole, give the oil its characteristic medicinal, camphoraceous aroma and its antimicrobial punch.
A widely cited study in the Medical Journal of Australia compared 5% tea tree oil gel to 5% benzoyl peroxide for acne treatment. Both reduced lesion counts significantly, though benzoyl peroxide worked faster. Tea tree oil caused fewer side effects (less dryness, peeling, and irritation). For people who want a natural alternative to benzoyl peroxide or who find BP too drying, tea tree oil is the most evidence-supported option.
Undiluted tea tree oil is a potent skin irritant. It can cause contact dermatitis, chemical burns, and allergic sensitization when applied neat (undiluted) to the skin. Always dilute tea tree oil in a carrier oil before topical application. A 5% dilution (approximately 3 drops of tea tree oil per teaspoon of carrier oil) is the concentration used in most clinical studies and provides effective antimicrobial activity without irritation.
Tea tree oil is also toxic if ingested. Keep it away from children, and never use it internally without medical supervision. Cats are particularly sensitive to tea tree oil and can be poisoned by even small amounts.
Most dermatologists recommend against applying undiluted tea tree oil to skin. Even on a single pimple, neat application can cause irritation, dryness, and potential sensitization. Dilute to 5% in a carrier oil, or use a pre-formulated product containing tea tree oil at an appropriate concentration.
Tea tree oil has demonstrated antifungal activity against common skin fungi including Candida and dermatophytes (which cause athlete's foot and ringworm). Clinical studies support its use as a complementary treatment, though severe infections should be treated with prescribed antifungals.
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