CPTG, or "Certified Pure Therapeutic-Grade," is a quality certification established by DoTERRA to maintain exceptionally high standards for their essential oils, free from contamination and synthetic fillers. These standards even exceed those of organic products. These include: Third-party testing by external experts to guarantee quality and offer transparency. The oils are: Examined after distillation to ensure their chemical compositions are up to standard. Re-checked by DoTERRA production facility to confirm consistency. Finally assessed during packaging to ensure pureness remains before oils are shipped out. High Production Standards: Using plants from optimal climate and locations for the best medicinal benefits. Growing them sustainably in uncontaminated soil. Before sale, an additional test checks the oil’s potency and purity. To learn more CPTG essential oils, click here.