The Vitamin Complex

The other nine are water-soluble: C (ascorbic acid) and the eight substances grouped together in what’s called the B complex—B1 (thiamin), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin, also sometimes referred to as vitamin H), B9 (folate/folic acid), and B12 (cobalamin). Sometimes choline is counted as a fourteenth vitamin, but usually the roster ends at thirteen.

Four are fat-soluble, meaning they dissolve in fat and need fat to be absorbed: A (retinol), D (cholecalciferol), E (tocopherol), and K (phylloquinone).

The other nine are water-soluble: C (ascorbic acid) and the eight substances grouped together in what’s called the B complex—B1 (thiamin), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin, also sometimes referred to as vitamin H), B9 (folate/folic acid), and B12 (cobalamin). Sometimes choline is counted as a fourteenth vitamin, but usually the roster ends at thirteen.

But as Tritsch explained, there are actually only thirteen human vitamins, all of which are organic compounds that occur naturally in food. Four are fat-soluble, meaning they dissolve in fat and need fat to be absorbed: A (retinol), D (cholecalciferol), E (tocopherol), and K (phylloquinone). T