The producer or seller will provide extensive information on his website about pure and high quality CBD oil, as this will distinguish him from dubious suppliers and offers of inferior quality. A transparent disclosure of cultivation, origin and laboratory analyses by independent testing institutes can confirm the purity of good CBD oil. This is not only about the active ingredient content, but above all about the detectability of fungi, bacteria or harmful substances (e.g. heavy metals, pesticides), which are not usually found in hemp from organic cultivation.
Further information on CBD oil.