I ate the vitamins to stay healthy.
You need your vitamin c
Rickets is a disease caused by a lack of vitamin D.
Citrus fruits are a good source of vitamin C
Scurvy is a disease caused by a vitamin C deficiency .
No, the word "vitamin" should not be capitalized unless it is the first word in a sentence or part of a proper noun (e.g. Vitamin C).
I am not writing a sentence using that word.
a sentence using the word endotracheal
This is a sentence using the word aviator.
The high vitamin and mineral content helps to boost immunity and energy levels, detoxify the system and purify the skin.
this is a sentence using the word armchair.
I am saying a sentence using the word collagen.
No. It's not necessary. Capitalize it only when it forms part ot the proper noun. Example: Vitamin Shop Store