Classification of vitamin A
PROVITAMIN A : β -Carotene
VITAMIN A1 : Retinol ( Vitamin A
alcohol)
VITAMIN A2 : 3 – Dehydro-retinol
VITAMIN A ALDEHYDE : Retinal
VITAMIN A ACID : Retinoic acid
VITAMIN A ESTER : Retinyl ester
Carotenoids, especially α– and β-carotene which are
potential provitamin A precursors that can be converted into retinol, are
present in plant products, especially green leafy vegetables, red palm oil and
yellow and orange fruits. Carotenoids are biologically less available than
retinol but they are generally more affordable than animal foods.
Health benefits of Vitamin A
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