it protect us from illness and it promotes growth...
Vitamin A. Humans cannot store Vitamin C.
Humans need sunlight to produce Vitamin D
There are many essential nutrients to humans. These include calcium, copper, chromium, choline, vitamin A, vitamin B12, as well as protein.
Vitamin C can be produced artificially, but occurs in natural form in most fruits and vegetables. Important sources are oranges, peppers and potatoes.
In humans, vitamin c.
Humans lack the enzyme necessary to produce vitamin C, known as L-gulonolactone oxidase. This enzyme is required for the conversion of glucose into vitamin C in other animals, but humans have a genetic mutation that prevents this process. As a result, humans must obtain vitamin C through their diet.
It's important because its a vitamin.
No. Silica, or silicon dioxide, is not a vitamin and should not be consumed by humans or animals.
For humans, nothing. (It may well be a vitamin for rats.)
vitamin c
It helps you see
Vitamin A doesn't have symptoms. Humans with either vitamin A toxicity or vitamin A deficiency have symptoms, however. Please be more specific with your question.