Hakka mint oil can be used for many purposes: put a few drops in your bath, shampoo, or body wash for a refreshing touch. Spray it to your pillow and bed sheets for more relaxed sleep.Put the oil diluted with water on q-tips, and clean your ears for coolness in the humid Japanese summer! Use to add fragrance to a wet napkin, handkerchief etc., as a room fragrance and for aromatherapy. Mint oil is food additive grade which mean it is edible and can be added into food.