Vitamin A

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Vitamin A benefit

Vitamin A source

Vitamin A is a fat-soluble vitamin.

Retinol; Retinal; Retinoic acid; Carotenoids

Vitamin A helps form and maintain healthy skin, teeth, skeletal and soft tissue, mucus membranes, and skin. It is also known as retinol because it produces the pigments in the retina of the eye.

Vitamin A promotes good vision, especially in low light. It may also be needed for reproduction and breast-feeding.

Retinol is an active form of vitamin A. It is found in animal liver, whole milk, and some fortified foods.

Carotenoids are dark-colored dyes (pigments) found in plant foods that can turn into a form of vitamin A. There are more than 500 known carotenoids. One such carotenoid is beta-carotene.

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• Beta-carotene is an antioxidant. Antioxidants protect cells from damage caused by substances called free radicals. Free radicals are believed to contribute to certain chronic diseases and play a role in the aging processes.
• Food sources of carotenoids such as beta-carotene may reduce the risk for cancer.
• Beta-carotene supplements do not seem to reduce cancer risk.

Review Date: 02/08/2011
Reviewed By: Alison Evert, MS, RD, CDE, Nutritionist, University of Washington Medical Center Diabetes Care Center, Seattle, Washington. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org).