CBD oil is a natural oil that is extracted from the flowers and leaves of the hemp plant. There are a few different ways to extract cannibinoids. The oldest technique is by using alcohol, then to the newer methods - CO2, and decarboxylation. However the alcholol extraction is a bit of an older technology and not used much anymore.
CO2 and Decarbolation are the prime methods found in the oils we carry as they are deemed to be much healtier than the alcholol method. Element Earth only carries brands that use the latter two of the three most common methods. It is important to know what extraction process your CBD has gone through as it effects the quality of CBD oil and gelcaps.