When it comes to the question of how to use CBD oil, the best we can do is provide guidelines, because everyone is different, and if anyone is concerned with the implementation of CBD into their diet, they should speak with their doctor. It really depends on several factors: experience with cannabis products, weight, height, and more. It’s best to start slow with a low dose, and gradually increase. Generally speaking, CBD oil is administered sublingually (under the tongue), held for 30-60 seconds, then swallowed or spit out.