Vitamin A

Last revised by Dr Daniel J Bell on 10 Jul 2021

Vitamin A are a group of fat-soluble vitamers (the retinoids) required for many physiological functions, mainly vision, reproduction and epithelial maintenance. In the retina, a specific retinoid, 11-cis-retinal, is formed by photoisomerisation within the rods and cones. The retinoids are hematinics.

Related pathology

Pathological manifestations can occur with both excess and deficiency:

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