Tea tree oil Manufacture Tea tree oil, also known as melaleuca oil, is derived from the leaves of the tea tree (Melaleuca alternifolia), which is native to Australia. It has been used traditionally by the indigenous people of Australia for various medicinal purposes. Here are some key points about tea tree oil: Antimicrobial Properties: One of the main characteristics of tea tree oil is its potent antimicrobial properties. It is known to be effective against bacteria, viruses, and fungi. This makes it a common ingredient in various skincare and haircare products. Skin Care: Tea tree oil is often used topically for its potential benefits in treating various skin conditions, such as acne, fungal infections (like athlete's foot and nail fungus), and insect bites. It is important to note that it should be diluted before applying to the skin, as it can cause irritation if used in its concentrated form.