Vitamin B3 (niacin) Vitamin B6 (pyridoxine) Vitamin B12 (cyanocobalamin) Pantothenic acid (B5) Biotin (B7) Folate (folic acid or B9) Vitamins are grouped into two categories: Fat-soluble vitamins are stored in the body's liver, fatty tissue, and muscles. The four fat-soluble vitamins are vitamins A, D, E, and K.