Vitamins are substances that our bodies need to develop and function normally. They include vitamins A, C, D, E, K, choline, and the group vitamins B (B1-Thiamin, B2-Riboflavin, B3-Niacin, B5-Panthenol, B6-Pyridoxine, B8/H-Biotin, B9-Folate, B12-Cobalamin).