beta carotene

Also found in: Thesaurus, Medical, Encyclopedia.

be·ta car·o·tene

also be·ta-car·o·tene  (bā′tə-kăr′ə-tēn′, bē′-)
The isomeric form of carotene that is most widely distributed in nature and is efficiently converted to vitamin A by the body.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

be′ta car′otene

the most abundant of various isomers of carotene, C40H56, that can be converted by the body to vitamin A.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

be·ta carotene

A form of carotene widely found in plants and animals. Beta carotene is most efficiently converted to vitamin A in the liver.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
In this study, Harvard researchers followed more than 4,000 men who were given either 50 mg of beta carotene every other day or a placebo pill.
Three new tomato breeding lines from ARS hold 10 to 25 times more beta carotene than typical tomatoes.
In one study, researchers examined how vitamin E, vitamin C, and carotenoids such as beta carotene collaborate to get rid of free radicals, whose harmful effects arise from their readiness to grab an electron from another molecule.
"Antioxidant nutrients such as Beta Carotene and Vitamins C and E help protect against harmful cell damage," claimed an ad by vitamin giant Hoffmann-LaRoche.
That's because these are among the richest sources of beta carotene, a nutrient believed to protect against cancer and cataracts.
government has sobering news for devotees of beta carotene. The dietary supplement doesn't prevent heart disease or cancer, and it may even increase a smoker's risk of lung cancer.
They contain an average of 58 milligrams per gram of fresh weight of beta carotene compared to about 1.5 milligrams per gram in normal tomatoes.
The most recent studies on a particular carotenoid, beta carotene, taken in supplement form, did not report such protection (see p.
Rothman explains that beta carotene must be converted into vitamin A in the body and that "the body regulates the amount of beta carotene it converts."
The three treatment groups received either beta carotene alone, vitamins C and E, or beta carotene plus vitamins C and E.
The vitamin combos included the vitamin A precursor known as beta carotene, two B vitamins, vitamin C, vitamin E, or other nutrients thought to provide a shield against cancer.
Then the researchers randomly assigned the study participants to nine months of maintenance therapy with either a low dose of 13-cis-retinoic acid or beta carotene, a natural vitamin A precursor found in many orange fruits and vegetables.