Functions of Food Additives 3. Nutrients – Maintain or improve the nutritional quality of food. Alpha- tocopherol Ascorbic Acid Biotin Beta Carotene Calcium Pantothenate Folic AcidFunctions of Food Additives 3. Nutrients – Maintain or improve the nutritional quality of food. Alpha- tocopherol Ascorbic Acid Biotin Beta Carotene Calcium Pantothenate Folic Acid