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.

just be there for her.

explanation:

not necessarily literally but figuratively. also don't say things like "i understand how you feel", because even though you are trying to , you clearly don't understand how she feels (i'm gonna go out on a limb here and assume you've never had a heart attack). also just let her rest. that is one of the best things for you to do.