While the therapeutic potential of CBD oil seems boundless, with new benefits continually being found, even good things come with some caveats. When ingesting CBD, finding your optimal dose means achieving the desired effects while avoiding unwanted side effects. So while there technically is no legal upper limit, taking an extreme amount of CBD oil can result in negative reactions.
Most human and animal research has shown CBD doses up to 1500mg per day have been well tolerated physiologically. However, consuming anywhere near that amount would be extremely costly and likely unnecessary therapeutically. Furthermore, body chemistry plays a major role in appropriate dosing – a quantity suitable for one person could produce unwelcome effects in another.