Although cannabidiol comes in various forms, one of the most popular is in oil-based products. After the plants have been cultivated to contain as little THC as possible, they are harvested by simply cutting them down. The next part involves extracting the desirable compound while discarding the rest. Commercial extraction techniques will typically make use of solvents. These solvents dissolve the CBD quicker than other compounds that might be present. They are extremely efficient at separating individual cannabidiol molecules from the rest of the cannabis plant allowing for a high level of purity within the resulting solution. The next step is to allow the solvents to evaporate. This might be done in a variety of ways, including leaving the solution out in the sun. What is left behind should be pure CBD oil. It can then be sold as it is or put into other products.