Oils are volatile aromatic compounds. This means that they waft into the air (the reason you can smell a lavender bush as you walk past it). They're extracts from plants found inside roots, seeds, flowers, bark. Now, my favourite part - they help keep the plant safe, warding away harmful pathogens and assisting with pollination - so you literally have nature's protection right there in those pretty little bottles. They’re concentrated, highly potent chemical compounds (wah! Yes, nature has natural chemicals, they are still chemical compounds) which act as messengers within your body, giving instructions to your cells. Interestingly, a plant's cellular structure is sim...