Tea tree oil has gained immense recognition as the strongest anti-fungal, anti-viral and anti-bacterial oil used in aromatherapy. It can be diffused or used neat, though recent studies have suggested that tea tree oil works best when well diluted. Tea tree oil is a very popular addition to skin care formulations for its germ-killing properties. Diffuse it during the cold season to keep germs from spreading. Use tea tree in masks and toners to combat acne. Use it in lip balms to fight cold sores. Used in a balm, tea tree can help to quickly heal wounds and keep an infection from setting in. Use it in mouthwashes to help treat oral disease. Tea tree blends well with lavender, peppermint, eucalyptus, niaouli, spikenard, sandalwood, and vetiver.