There are used by the body to maintain health.

the answer you are looking for is Vitamins

There are 13 essential vitamins.

here are the types of vitamins

Vitamin A

Vitamin C

Vitamin D

Vitamin E

Vitamin K

Vitamin B1 (thiamine)

Vitamin B2 (riboflavin)

Vitamin B3 (niacin)

Pantothenic acid (B5)

Biotin (B7)

Vitamin B6

Vitamin B12 (cyanocobalamin)

Folate (folic acid and B9)

hope this helps

Vitamins

Explanation:

There are 13 vitamins that are used to maintain health.  Some of the vitamins are fat soluble (A, D, K, E), while others (B complex) are water soluble.