Here is my personal Response when people ask me about Young Living essential oils purity? (CRAZY LOOK ) …. Really …. I don't know all I know is I have been with this company for 16 years and been to many of our farms all over the world, watched our distillations, seen our laboratories, testing equipment and how we test our oils. As a Doctor with a Science degree I know our testing is the best. But more importantly I have used these essential oils and all Young Living products for more than 16 years on myself, my children, my family, with hundreds of patients and thousands of clients. I have them get amazing results, over and over again a thousand times, year after year. So I think the best way to know if our oils are pure is to test them yourself and see if you get results too.