There are 13 what that are used by the human body to maintain health?

There are 13 essential vitamins that the human body requires to maintain health. These include vitamins A, C, D, E, K, and the B vitamins (B1, B2, B3, B5, B6, B7, B9, and B12). Each vitamin plays a unique role in bodily functions, including energy production, immune response, and the maintenance of healthy skin and vision. A balanced diet is crucial to ensure adequate intake of these vitamins.