One day, my friend asked me to recommend her a “therapeutic grade” essential oils’ brand. What does she means? Is she looking for the essential oil that has therapeutic effect on her? Or she is concerning on the product safety? Or she is looking for high quality and non-adulteration products? According to Stewart (2005)… “A therapeutic grade essential oil is defined here as one that is specially distilled from plants that are cultivated organically or grown wild in a clean environment (not gathered along a busy highway). Plants should be from proper botanical genus, species, and cultivar. No chemical fertilizers are added to the soil, and crop cultivation is free of herbicides and pesticides. Essential oils should be extracted by steam distillation at minimum temperatures and pressures, as was done in ancient times. No chemical solvents are used in the extraction process.” In my teacher Jade Shutes article, she does mention that this “therapeut...