Researchers have found that thecarotenoids Lutein and Zeaxanthin, in this instance extracted from the blue-green algaeChlorella, can possibly contribute to reducing the growth of colon cancer. The carotenoids blocked the growth of human colon cancer cells in a test tube the scientists found.Lutein and Zeaxanthin are well known for eye health and benefit for macular degeneration. They were not the only xanthophyll-carotenoids present in the algae but they were the most bioactive.
The scientists also found the extracts had a more powerful anti-cancer effect when used in combination than used individually. “These semi-purified extracts of Chlorella both inhibited the growth of HCT116 (the type of colon cancer cells) in a dose-dependent manner,” they said meaning the more the better. The study is published online ahead of print in the October 23rd, 2008 issue of the Journal of Agriculture and Food Chemistry.
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