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NOW Foods Astaxanthin Extra Strength is a naturally occurring carotenoid that, because of its unique structure, delivers a wide range of antioxidant benefits. Astaxanthin can help to protect cell membranes against free radical attack and possibly bolster the action of other antioxidants like vitamins E and C. Scientific studies have demonstrated that astaxanthin can help to support a healthy immune system response. Recent research indicates that astaxanthin may even help to support the skin's structure during exposure to sunlight.