CBD oil capsules are popular natural supplements that are used to remedy a host of common ailments. CBD (cannabidiol) is one of over a hundred chemical compounds that can be extracted from the marijuana or cannabis plant. One other chemical component that you might have heard of that can be extracted from the marijuana plant is THC (tetrahydrocannabinol). CBD, however, is nothing like THC, which is a potent psychotic that recreational cannabis users take to get 'high'.