1. Researchers list these factors that determine the provitamin A activity of carotenoids: 2. Provitamin D 2 is ergosterol, and provitamin D 3 is 7-dehydrocholesterol.3. Provitamin D 2 is ergosterol, and provitamin D 3 is 7-dehydrocholesterol. 4. Menadione is a synthetic provitamin of vitamin K. 5. Kiwifruit pulp contains carotenoids, such as provitamin A beta-carotene, lutein and zeaxanthin. 6. It is commonly found as its alcohol analog, the provitamin panthenol ( pantothenol ), and as calcium pantothenate. 7. Newer research has shown that the absorption of provitamin -A carotenoids is only half as much as previously thought. 8. His laboratory was the first to produce a GM tomato with elevated levels of ? carotene ( provitamin A ). 9. Golden Rice 2 contains sufficient provitamin A to provide the entire dietary requirement via daily consumption of some 75g per day. 10. Some phytochemicals have been considered as possible drugs for millennia, while others, like carotenoids, are significant as provitamin compounds.
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