The compound is extracted from the resins of mature female hemp flowers. Some manufacturer’s use industrial hemp stalk as a source of CBD, however, the vast majority of cannabinoids are concentrated purely in the flowers, not the stalk, stems, or leaves.
Furthermore, it requires vast quantities of industrial hemp stalk to produce a viable amount of CBD extract. And because hemp is a bio-accumulator, this can lead to contaminants such as heavy metals or other toxins remaining in the final concentrate.
The ideal source of CBD is from organic, non-GMO hemp grown in the United States for its resinous flowers, not its fibrous stalk.
CBD can be extracted from hemp in a number of ways. High-quality CBD extracts are produced using a method called, supercritical CO2 extraction.
This method utilizes carbon dioxide and temperature to separate and isolate CBD and other molecules, and is generally considered the safest and cleanest form of extraction available today.