Abstract: The disclosure relates to a process and composition for determining the quantity of a vitamin added to a foodstuff such as a beverage. The process involves (a) combining a predetermined amount of a chemical marker with a composition which is a carrier in combination with a predetermined amount of a vitamin to obtain a vitamin composition; (b) adding the vitamin composition to a foodstuff to obtain a vitamin fortified beverage; (c) quantitatively determining the amount of the chemical marker in the vitamin fortified foodstuff; and (d) correlating the quantitatively determined amount of the chemical marker in the vitamin fortified foodstuff with the predetermined amount of vitamin in the vitamin composition.