Our purity standards are the highest. Because we do not use synthetic materials, contaminants, cheap fillers, and run production processes ethically, we take essential oils directly from our own plantations, Seed to Seal certified suppliers, and carry out extensive tests. If an essential oil does not meet our stringent test requirements, the essential oil will be rejected and not used in any Young Living product. These are all part of the Seed to Seal standard with all three pillars: Source, Science, and Standards.