A common question arises, "What Dosage of CBD should I take?" Simple answer, if using a tincture(CBD Oil under the tongue,) buy a vial at 750-1500 mg per 30 ml and take 1/2 a ml twice a day. However, since official medical standard do not yet exist, consult your doctor. Manufacturers may recommend starting at 10-20 mg twice a day for an adult, may slowly increase to 20-45 mg twice a day. Some use the rule of using 1-6 mg/lb in body weight twice a day. We at Prime Spectrum CBDs, we have no official stance on dosing recommendations as CBD products are typically considered supplements.