Vitamin A

Plays an important role in vision, bone growth, immune function and tissue and skin formation. There are two forms: provitamin A, a carotenoid found in fruits and vegetables, and preformed vitamin A that is absorbed in the form of retinol from animal sources such as beef, chicken liver, milk and eggs. Topically the skin rejuvenation effects of retinoid forms (retinoic acid, retinyl palmitate, isotretinoin, tretinoin [retin A] and retinol) are well documented. They work by increasing cell turnover and are used to treat photoaged skin, age spots, acne and psoriasis. Can cause skin irritation and flaking. Vitamin A oral supplementation and topical application should be avoided during pregnancy, as excess levels are known to cause birth defects. See Beta Carotene, Retinol.

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