Purity starts in the fields, but it's also proven in the lab. The highly trained scientists of the Young Living Research Institute perform hundreds of tests at every step of their essential oil processing to ensure that you receive the purest, most potent, and highest quality essential oils and oil-infused products. I believe it because I’ve seen it. Touring a YL farm and touring the YL Utah lab was an eye opening experience. I will never forget the strong belief in the excellence of their product behind everything they did. Young Living essential oils are the best.