Science behind the Oils https://www.doterra.com/US/en/about-science
The Source https://sourcetoyou.com
CPTG ? https://www.doterra.com/US/en/blog/healthy-living-cptg-the-doterra-difference
https://www.youtube.com/watch?v=lNjukTPeVao&list=PLp3VbOdUkkm3887OIQVENKX7rkXGTpeFq