In theory yes you could take to much CBD, in practice, It's very unlikely. To take to much CBD from a physical perspective you would have to ingest substantial amounts of CBD. Recent studies show that there is little to no potential for physical harm. The FDA recently funded a study to ascertain CBD's safety and to see if there is any potential for liver damage. So far, the result has shown no evidence of liver toxicity in the 839 adults consuming oral CBD Read the study here: Taking to much so that you feel nauseous or over tired would be another angle to answer this question. It is possible that taking to much full-spectrum CBD 'for you', will make you sleepy, possibly nauseous or, depending on the carrier or product, could give you an upset stomach.