No matter how carefully the distillation process is carried out, essential oils should be tested for their purity and potency before being packaged. Quality testing ensures that every bottle of essential oil contains nothing but 100 percent pure volatile aromatic compounds at the correct ratios to allow for maximum efficacy. Together, gas chromatography, mass spectrometry, infrared spectroscopy, heavy metal testing, organoleptic testing, and microbial testing provide a canon of quality testing procedures that allow for the most thorough analysis possible. Additional tests such as isotopic analysis and chirality testing also provide important information about the quality of essential oils.
There are two main goals of these quality control tests.
Unfortunately, there is no regulatory body that oversees the quality or safety of essential oils. It is therefore up to us to ensure that our products are completely pure, free of adulteration, and have the desired beneficial characteristics.