We purchase directly from proven distributors which provides us withGC/MS Gas Chromatography (GC), Mass Spectrometry (MS) testingon all of our essential oils. This test will show everything in the oil, ensuring it is not synthetic or adultered in any way. This is the first step in ensuring the oils have been unaltered. This test is done in a lab where they test the oils for purity. This document is available on each product page and is updated every time we receive a new batch. We are also provided with theCertificate of Analysis (CA)which gives us another tool to make sure our essential oils are at their purest. We will NEVER sell a oil that does not pass our testing.