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Powerful Free Radical Neutralizer Supports Balanced Responses of the Immune System Astaxanthin is a natural carotenoid that, because of its unique structure, plays an important role in cellular protection against free radicals and in the health of immune system responses. Astaxanthin is derived from non-transgenic Haematococcus pluvialis microalgae and has natural lutein, canthaxanthin and beta-carotene.