A Tea tree oil is derived from the leaves of the Australian tea tree (Melaleuca alternifolia). The oil contains terpenes that act as natural antibacterial agents. These compounds kill bacteria and fungi, which helps prevent infections.
Tea tree oil is one of the few oils that will actually penetrate through the cuticle layer of your hair shaft and into the cortex, where it can help reduce frizziness. This is because tea tree oil penetrates the hair follicles, helping to moisturize them and keep them healthy.