I work for a Pharmaceutical company developing CBD drugs. I can tell you for a fact that the crap that is out there over the counter does not have appropriate levels of CBD to relieve pain and inflammation. We know, we have tested them and they are little more than snake oil.
We use pure synthetic CBD and our clinical results are amazing. We are currently the World leader in CBD Pharmaceutical development. THC is not part of our research since it it psychoactive and only acts on the mind...not the body.