No. Cannabinoids have no known toxicity limits. There are many users out there with severe adaptations and needs who use over 1,000mg per day, just to stay balanced. But unless prescribed by your doctor, do do not suggest that amount as it would likely be wasteful to your needs and be counter productive. Under 300mg per day is best used by the average human body.
We are all vastly different which is why we made The Ultimate CBD Dosing Guide. We always recommend for you to start with a low dose and work your way up so that it effectively saves you time and money while you are getting your dosing down for your personal needs.