Concentration refers to the total amount of CBD in a given product. Concentration is measured in milligrams (mg). This is different from dosage, which indicates the amount of CBD per serving. For instance, let’s say a bottle of CBD tincture has a concentration of 300 mg and contains 10 milliliters (mL) of tincture, with 1 mL as the standard serving size. This means each 1-mL serving will contain approximately 30 mg of CBD.