The effectiveness of CBD is also dependent on the purity of the hemp oil after it is extracted from the plant. There are several types of extraction processes that separates oil from the plant. One way is to use a solvent, similar to how we use soap to remove dirt. However, some companies tend to use petroleum-based solvents (increases cancer risk) or ethanol (hard to remove from CBD oil at the end). A much safer and cleaner method is called ‘Supercritical CO2 Extraction’, which allows one to pinpoint exactly what compounds to remove and leads to a pure, safe, and high-quality oil.