Retinol is the most active form of vitamin A. Vitamin A is synthesised from carotenoids, such as beta-carotene. These precursors, also known as "provitamins", are found in carrots, apricots and sweet potatoes. Provitamin A is then converted into vitamin A in the intestine.
Vitamin A is also present in the retina, where it plays an essential role in vision, particularly in terms of the eye's adaptation during the transition from light to dark. In addition, vitamin A is said to have a beneficial effect on the skin by promoting pigmentation through its effect on stimulating melanin production.
Vitamin A, whose most biologically active form is retinol, contributes to the maintenance of normal skin and mucous membranes.
It is also involved in the process of cell specialization and in the normal functioning of the immune system. In addition, vitamin A is involved in the maintenance of normal vision.
Vitamin A also contributes to the normal metabolism of iron.