With doTERRA, you can be sure that every bottle is 100% pure and potent. doTERRA is one of the only companies to share the chemical profile of each bottle of oil. Each bottle of doTERRA essential oils has lot number listed on the bottom.
You simply go to their SourceToYou.com website, input that number and get the quality report for that bottle. Other companies are testing their oils and using third party chemists, but not making that information known to the public.