For quicker and maximum absorption, both CBD oils and tinctures may be taken sublingually under the tongue. By utilizing this delivery method, the cannabinoid is able to be absorbed through mucous membranes in the mouth, and then the bloodstream. Perhaps the reason why CBD oil and CBD tinctures are some of the most popular CBD products is due to the higher bioavailability they offer. However, it’s important to note that CBD oils may still take longer to kick in compared to other methods.