Oils with standardized content of components (marked FCC, for Food Chemicals Codex) are required[by whom?] to contain a specified amount of certain aroma chemicals that normally occur in the oil. There is no law that the chemicals cannot be added in synthetic form to meet the criteria established by the FCC for that oil. For instance, "lemongrass essential oil must contain 75% aldehyde to meet the FCC profile for that oil, but that aldehyde can come from a chemical refinery instead of from lemongrass."  To say that FCC oils are "food grade" makes them seem natural when they are not necessarily so.
Essential oils are available online, in health food stores, and in some regular supermarkets. It’s important to buy from a reputable producer since the oils aren’t regulated by the FDA. This ensures you’re buying a quality product that is 100 percent natural. It shouldn’t contain any additives or synthetic ingredients. Check out these essential oils available on Amazon.