: Often found in stores like Whole Foods, this brand is part of a member-owned co-op and uses GC/MS testing to verify the purity of its sustainably sourced oils. Key Indicators of Purity

: A major industry leader that utilizes a strict Certified Pure Tested Grade (CPTG) protocol, which includes multiple rounds of testing to guarantee purity and potency.

When reviewing oils on your own, experts from the Aromatherapy Trade Council recommend checking for: Recommended brand fo PURE essential oils? : r/essentialoils