There are not so many different grades of vitamins that exists in the commercial world. The vitamins which comply with pharmacopoeia standards like IP, BP, USP and FCC monographs are only used in the fortification. Specifications are available in Indian Pharmacopoeia, British Pharmacopoeia, United States Pharmacopoeia, European Pharmacopoeia and Food and Chemical Codex monographs. These standards also define the impurity and purity levels for the premixes.
