Beta-carotene

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<h1>Beta-carotene</h1>Author: <a title="Douglas Adams" href="http://www.articlesbase.com/authors/douglas-adams/3816.htm">Douglas Adams</a> Beta-carotene is the only carotenoid that can be converted to significant amounts of vitamin A, and only about one-sixth is converted in humans. Dietary fat is required for the adequate absorption of carotene. The deeper the orange coloring of a carrot, the higher the concentration of beta-carotene.

In an Arizona study, 26 of 49 patients with oral leukoplakia, a premalignant lesion, were given 60 milligrams daily of beta-carotene for six months, resulting in a significant reduction in the size of their lesions. However, excessive ingestion of beta-carotene and other carotenoids from dietary sources or supplements may cause a yellowing of the skin. Fortunately, the skin pigmentation
is reversible with reduction in the quantity of beta-carotene consumed. There is no evidence that natural sources of beta-carotene are more effective than synthetic sources.

Retinol
The major vitamin A compound is found naturally in eggs, dairy products, liver and fish-liver oil. The compounds require proteins for their absorption from the intestines. Etretinate, a synthetic retinoid, appears to be effective in the treatment of psoriasis. Half of 32 patients being treated for advanced cervical cancer had a 50 percent regression in the size of their tumors when treated with oral 13-cis-retinoic acid and alpha interferon.
About the Author: Douglas Adams is the owner of <a href="http://www.allwellbeing.com"> All Wellbeing.com</a> , a website dedicated to increasing knowledge of health related issues.

<a href="http://www.shaklee.net/douglas_adams">For high quality health care products click here.</a>
Article Source: <a href="http://www.articlesbase.com/">ArticlesBase.com</a> - <a href="http://www.articlesbase.com/health-articles/betacarotene-19137.html" title="Beta-carotene">Beta-carotene</a>

Beta-carotene is the only carotenoid that can be converted to significant amounts of vitamin A, and only about one-sixth is converted in humans. Dietary fat is required for the adequate absorption of carotene. The deeper the orange coloring of a carrot, the higher the concentration of beta-carotene.

In an Arizona study, 26 of 49 patients with oral leukoplakia, a premalignant lesion, were given 60 milligrams daily of beta-carotene for six months, resulting in a significant reduction in the size of their lesions. However, excessive ingestion of beta-carotene and other carotenoids from dietary sources or supplements may cause a yellowing of the skin. Fortunately, the skin pigmentation is reversible with reduction in the quantity of beta-carotene consumed. There is no evidence that natural sources of beta-carotene are more effective than synthetic sources.

Retinol The major vitamin A compound is found naturally in eggs, dairy products, liver and fish-liver oil. The compounds require proteins for their absorption from the intestines. Etretinate, a synthetic retinoid, appears to be effective in the treatment of psoriasis. Half of 32 patients being treated for advanced cervical cancer had a 50 percent regression in the size of their tumors when treated with oral 13-cis-retinoic acid and alpha interferon.

Douglas Adams is the owner of All Wellbeing.com , a website dedicated to increasing knowledge of health related issues.

For high quality health care products click here.

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