The best strength of CBD oil depends on various factors, including the person's weight, tolerance, and the condition being treated. In general, it is recommended to start with a low to moderate strength and gradually increase the dose as needed. It is also important to consult with a healthcare professional, especially if using CBD oil to treat a medical condition, as they can provide personalized advice and guidance on the best dose for your individual needs. It is important to note that there is no one-size-fits-all answer when it comes to the best strength of CBD oil, as the ideal dose can vary from person to person. It is always recommended to start with a low dose and gradually increase it until you find the dose that works best for you.