The use of pure essential oils from plants dates back many centuries, and the history of Aromatherapy is in many ways part of the history of herbal medicine as a whole. The Arabic countries are credited with first discovering the process of distillation of oils around a thousand years ago and since then, their use has spread both eastwards through the Indian sub-continent and westward to Europe. Much modern research has taken place, for example, in France, ranging from perfumery applications to medicinal uses as powerful anti-infective agents.
Essential oils are highly concentrated substances, hence, these should be used sparingly. Large doses could be somewhat irritating to the skin, and a few are quite toxic if not used correctly. Aromatherapy oils should be kept in well-stoppered bottles, away from the sun, when not in use.A large part of their effect on our moods and emotional states occurs through our sense of smell, therefore, it is important not to use any individual oil for too long, as they become tolerated and less useful.