A quality oil is, by definition, a product that contains quality ingredients. The amount of ingredients is also important to consider. If the presence of terpenes and flavonoids (they contribute to the aromas and encourage the effects of cannabinoids) is justified and even encouraged, certain elements have nothing to do with your oil. This is for example the case ofartificial flavors, colorants or preservatives. This is also obviously the case for GMOs or the remains of chemical products that would come from intensive agriculture (fertilizers, pesticides, heavy metals, etc.). It is then important to pay attention to the extraction mode, i.e. the method that allows cannabidiol to be separated from the other elements present in the hemp plant. The cleanest is undoubtedly the one to CO2 supercritical. It has the advantage of do not overheat cannabinoids which would then lose at least part of their properties, which is the problem of hot extractions (oil extraction). She don't let no no more leftovers in the finished product, unlike solvent extractions which can be dangerous to health if performed incorrectly.