For a relaxing and revitalizing atmosphere, add 5 drops of essential oil to the diffuser. To fight stress and depression, add 6-8 drops of essential oil to warm water and relax in the bathtub for at least 10 minutes. To treat acne, add 15 drops of essential oil to 50ml of the carrier oil of your choice. To soothe sore throats and stimulate the immune system, put 6-10 drops of essential oil onto a tissue and take deep breaths.