Administrative Dietitians Recommended Nutritional Functional Food (Biotin, Vitamin C, Calcium) Biotin is a nutrient that helps maintain skin and mucous membranes. Vitamin C is a nutrient with antioxidant properties to help maintain healthy skin and mucus membrane. Calcium is a nutrient necessary for the formation of bones and teeth. 12 types of vitamins; 10 different minerals; Economical large capacity type with 60 days supply.