Quantum Leaf Naturals uses the gold standard of extraction methods called CO2 Extraction. CO2 Extraction method produces the purest, most potent and most powerful CBD oil on the market. It is also the safest and cleanest of all extractions methods because it leaves behind no harmful solvents. CO2 Extraction Method uses carbon dioxide under high pressure, extremely low temperatures to preserve, separate, and maintain the purity of CBD oil. Many other companies use cheap methods that involve toxic solvent. These toxic solvents leave behind unsafe residues in their oil such as BHO, propane, hexane or other hydrocarbons unlike CO2 Extraction Method. Quantum Leaf Naturals full spectrum CBD oil is 100% natural and are toxin and solvent free. They do not contain synthetic chemicals, dyes or artificial flavorings.