Deficiency diseases are more prevalent in developing countries. For example, Vitamin A deficiency is a common cause of blindness in the developing countries. As new researches bring out conflicting results, the recommendations about Vitamins continue to swing between 'just enough' to mega-dose therapies. Therefore it is important to be aware of what the Vitamins are. Carotene compounds responsible for transmitting light sensation in the retina of the eye.
Deficiency leads to night blindness.
An antioxidant that protects cells against oxidation damage that can lead to cancer.