What we mean by FECO is an abbreviation. This abbreviation refers to cannabidiol oil that contains all of the cannabinoids. FECO is vastly different and superior to RSO (Rick Simpson Oil), which it is commonly confused with. The fact that FECO is a concentrated, whole-plant extract is how it has made its name in the industry. Numerous useful compounds and terpenes are extracted from it when it is used. Even though FECO can be used for fun, it is best known for its therapeutic benefits. So, Where To Buy Feco Oil.