100% Pure Australian Tea Tree Oil is a natural essential oil organically grown in Australia. It is free of herbicides, pesticides and chemicals. Aborigines have been using Tea Tree for centuries for various uses. In fact it was considered so effective that the Australian military issued Tea Tree Oil to their soldiers during World War II. When modern scientists tested the oil from the Melaleuca Alternifolia leaves, they discovered that it contained over 100 different chemical compounds. These compounds are what make Tea Tree Oil so versatile.