No U.S. government or agency generally accepted agency "grades" or "certifies" essential oils as "therapeutic grade," "medicinal grade," or "aromatherapy grade." In fact, the United States has no formally approved essential oil grading standard. Yet, you see every essential oil independent consultant claiming their "therapeutic grade" oil has the "highest quality" and that you should trust them because they have "done research." Generally the research they are referring to is one hour class when they joined the oil company taught by someone whom only education in oils is also a one hour class.