(It was not found to have an effect.) As such, it wouldn’t be fair to say that 5 or even 20 mg of CBD oil in your coffee is proven to do nothing; that hasn’t been proven. It’s more accurate to say that 20 mg of CBD oil in your coffee has never been proven to do much of anything, and related research indicates that’s probably way too low of a dose to have any measurable effect.I cared for my defacto partner who suffered a lot pain etc with cancer, he passed away in April. We asked about CBD oil throughout the 4 years he was receiving treatment. I think if he knew about this site, he would have opted for alternative treatment.