Analysis using gas chromatography (GC) and mass spectrometry (MS) establishes the quality of essential oils. These techniques are able to measure the levels of components to a few parts per billion. This does not make it possible to determine whether each component is natural or whether a poor oil has been 'improved' by the addition of synthetic aromachemicals, but the latter is often signaled by the minor impurities present. For example, linalool made in plants will be accompanied by a small amount of hydro-linalool, whilst synthetic linalool has traces of dihydro-linalool.
Hey Karen, There’s so much information on essential oils and much of it comes from MLM companies looking to sell lots of oils (much like Avon). These companies work on a commission basis and encourage reps to push information that’s not always safe or studied. I think much of the information on ingesting oils comes from these companies and sellers. I wouldn’t advise ingesting oils unless under the care of a natural doctor that knows what they are doing. One of the best sources for all-things essential oil safety is this independent site run by a certified aromatherapist: http://www.learningabouteos.com/. Plant Therapy also provides great information on their blog. Hope that helps :).
It’s important to choose the best essential oil, depending on the health concern or condition that you are trying to remedy. Each essential oil is made up of different compounds and possess different properties, so while some oils are great for relaxing your mind, easing muscle tension and promoting restful sleep, other oils are stimulating, energy boosting and support cognitive function.
The inhaled aroma from these "essential" oils is widely believed to stimulate brain function. Essential oils can also be absorbed through the skin, where they travel through the bloodstream and can promote whole-body healing. A form of alternative medicine, aromatherapy is gaining momentum. It is used for a variety of applications, including pain relief, mood enhancement and increased cognitive function.