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Tea tree oil shampoo, used to treat lice infestations, contains about 10 drops of pure tea tree oil for every eight ounces of shampoo. Tea tree oil is an essential oil that comes from the leaves of an Australian native tree, the Melaleuca alternifolia. The oil is known for its antiseptic, antifungal and antibacterial properties.
Source:
International Aromatherapy and Herb Association: The Benefits of Tea Tree
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