Vitamin A Health

Vitamin A is essential, either directly or indirectly, for the function of all the organs in your body and is particularly important for growth and development.
Despite the fact that vitamin A was the first vitamin to be discovered, its actions in the cells of our bodies are not well understood at a chemical level.

Maintenance of normal vision

Our eyes need vitamin A to function effectively as vitamin A is involved in the production of a chemical called visual purple, which helps us to see in dim light.

Growth, repair and cell differentiation

Vitamin A is necessary for the growth and repair of many body cells including those of bones, teeth, collagen and cartilage. It is also essential for a process
known as cell differentiation in which unspecialized cells are modified so that they can perform specific functions. Thus vitamin A plays a central role in
tissue development and maintenance.

Vitamin A EffectsHealth of epithelial cells

Vitamin A is vital for the formation of healthy epithelial cells. These cells cover the internal and external surfaces of the body and are found in the skin, lungs, developing teeth, inner ear, cornea of the eye, sex organs, glands and their ducts, gums, nose, cervix and other areas. Many epithelial cells produce mucus which is necessary to lubricate body surfaces and protect against invading microorganisms. For example, the good health of the digestive tract lining is important

in protecting against ulcers, and maintenance of the lining of the vagina anduterus is important in fertility.

Pregnancy and fetal development

Because of its vital role in cell development and differentiation, adequate vitamin A helps to ensure that the changes which occur in the cells and tissues during
fetal development take place normally. It may be involved in cell to cell communication.

Protection against infection

Known as "the anti-infective vitamin," vitamin A plays an essential role in protecting your body from infection. It keeps body surfaces healthy so they can
act as barriers to invading microorganisms. Vitamin A stimulates and enhances many immune functions including antibody response and the activity of various

white blood cells such as T helper cells and phagocytes. This immune-enhancing function promotes healing of infected tissues and increases resistance to infection.

Other actions

Laboratory experiments have shown vitamin A to have antiviral activity. Vitamin A also has antioxidant activity and has a role in protecting against free radical
damage which contributes to many common diseases. Vitamin A is involved in iron metabolism and storage.

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Vitamin A
Vitamin A Health
Vitamin A Absorption
Vitamin A Deficiency
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Vitamin A Recommended Daily
Vitamin A Overdose
Vitamin A Interactions
Vitamin A Dangerous



Other Vitamins:

Vitamin A
Beta carotene
Vitamin B6
Vitamin B12
Pantothenic acid
Vitamin C
Vitamin D
Vitamin E
Vitamin K