KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
Vitamin A. Computer model of part of a molecule of vitamin A, or retinol (C20. H30. O). Atoms are represented as balls and are colour-coded: carbon (gold) and hydrogen (white). The oxygen atom is out of frame at lower right. Vitamin A is essential for normal growth and development. It is needed for the production of bones and teeth, for protection against infection and for night vision. It is found in eggs, liver oils and dairy products. It can also be made in the body from the carotene found in many vegetables and fruits.
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