The rate and the extent to which a vitamin is absorbed and used in the body is known as its

The rate and the extent to which a vitamin is absorbed and used in the body is known as its bioavailability.

It is an essential measurement tool because it determines the correct dosage for non-intravenous administration of a drug. The measurement of bioavailability is represented by the letter f or F if expressed in percent. The bioavailability of a drug varies from person to person and it may be affected by physiological and other factors.