Pharmacognosy - medicinal plants (herbs)

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Theme XIII: Vitamins

Vitamin A

What is Vitamin A? Description, chemical formula, function and features. Lack and excess, sources of vitamin A.

What is Vitamin A?

Vitamin A is a primary alcohol derivative of the carotenes present in vegetables.

Chemical formula of Vitamin A:

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Roles, deficiency and sources of vitamin A


Vitamin A is involved in the formation and maintenance of skin, mucous membranes, bones and teeth, vision and reproduction.

Deficiency and excess of vitamin A

The deficiency of this vitamin can cause night blindness, dry skin, lack of secretion of the mucous membrane and eyes.

Excess of vitamin A can interfere with growth, stop menstruation, damage the red blood cells and cause skin rashes, headaches, nausea and jaundice.


Sources of vitamin A

It's obtained from vegetables containing carotene as carrots, broccoli, squash, pumpkin, spinach, cabbage, sweet potato and other organisms that eat plants.

Vitamin A is found in milk and dairy products, eggs, liver and fish liver oil.

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