First of all, you have to make sure that the hemp plant from which the extraction is done is a CBD-rich plant. The cannabis strains richest with CBD are the sativa strains (as opposed to THC-rich indica strains). Then comes the extraction process. There are several CBD extraction methods, such as using neurotoxic solvents (i.e., butane, hexane), ethanol (suitable for home-based extraction), or the more common CO2 extraction method.
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