Doctor s Best Astaxanthin supplies natural astaxanthin an exceptionally valuable carotenoid nutrient along with other naturally occurring carotenoids. Astaxanthin is an ultrapotent antioxidant with unique effects on cell membranes that manage important life functions. This action is linked to clinically proven benefits for the circulation and for vision immunity and overall well-being. Doctor?s Best is pleased to offer this breakthrough nutrient at clinical potency.