A new standard in essential oils - doTERRA oils are CPTG - Certified Pure Therapeutic Grade. They are guaranteed to be of consistent, safe and superior quality in every bottle. Because of this quality, doTERRA essential oils can actually penetrate the cell wall unlike pharmaceutical antibiotics and with NO BAD SIDE EFFECTS. WHY? Because they are sourced from their natural habitat, grown and harvested WITHOUT any HERBICIDES or PESTICIDES, extracted using the correct temperature and pressure and then rigorously TESTED BY INDEPENDENT SOURCES to ensure the PURITY (ie no weeds, bacteria, soil etc) and COMPOUNDS comply, and are second to none and ready for use.