A Scents Worth Effects On The Mind - A cleansing, stimulating and revitalizing oil which may be useful after emotional crisis. Effects On The Body - Tea Tree oil is active against bacteria, fungi, and viruses. The most important property of this essential oil is its immuno-stimulant action. Because of its ability to help the immune system, Tea Tree is one of the most important oils available in the treatment of HIV. Tea Tree is also valuable in treating colds, flu, cold sores, sunburn, acne, shingles, chickenpox, ringworm, Candida, and athlete’s foot.