Dr E. Joy Bowles gives her scientific insight into what we know and what we don't know about how essential oils work on the human body. She high-lights the different ways you can use essential oils, via inhalation, applying them to the skin, and taking them in capsules like medicine, and the risks and benefits of each method. In her light and easy way, and with reference to the scientific literature, Dr Joy helps readers feel more confident in using essential oils safely and effectively to enhance their wellbeing.