I have learned so much about the value of the GC/MS testing, and why you do it. Having been the recipient of both very inexpensive essential oils that I thought were good quality, inexpensive essential oils that smelled horribly of chemicals and now some terribly expensive name brand essential oils, I read your third party testing with great interest, not only to see what the results are, but also to see how company’s respond. I lot can be learned, or at least I have learned a lot, by reading if a company gets angry and defensive about your third party results, or if they thank you, pull the product, and make sure only their best oils are available to consumers. This has been in invaluable tool for me, while learning about essential oils, but being on an incredibly limited income due to being in between brain surgeries due to a very rare disorder- the reason I became interested in natural healing with oils, but also the reason I do not have much to spend on them. Thank you so much for this amazing resource! I would most like The Encyclopedia of Essential Oils. Thanks again!