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The best vitamin A supplement

13 January 2002

Vitamin A is commonly known as the anti-infection vitamin. It plays an important role in vision and bone growth, and maintains the surface linings of the eye and respiratory, urinary and intestinal tracts (Pediatr Nurs, 1996; 22: 377-89, 456; Proc Nutr Soc, 1999; 58: 289-93).

Retinol, one of the most usable forms of vitamin A, is found in animal foods, such as liver and eggs. Some plants contain orange pigment - provitamin A carotenoid - that the liver converts to retinol. Beta-carotene is one such carotenoid found in many foods (Phamacol Ther, 1997; 75: 185-97; Eur J Clin Nutr, 1996; 50 [Suppl 3]: S38-53). Beta-carotene has two roles in the body. It is converted into vitamin A if the body needs it. If not, beta-carotene acts as an antioxidant to protect cells from damage by harmful molecules called free radicals.

It’s important to regularly eat foods that provide vitamin A or beta-carotene, even though your body can store vitamin A in the li...

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