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https://www.medicaldaily.com/high-levels-alpha-carotene-blood-improves-longevity-234955 High levels of alpha carotene in blood improves longevity Nov 23, 2010 - High levels of alpha carotene in the body increase the chance of longer life, researchers at the Centers for Disease Control and Prevention, Atlanta said in a... high levelsalpha carotenein bloodimproveslongevity