Science-Based Nutrition Ultra-Potent Natural Antioxidant Dietary Supplement Vegan Non-GMO Gluten Free Soy Free Doctor's Best Astaxanthin with AstaPure supplies astaxanthin, a natural carotenoid pigment, ultra-potent antioxidant and free radical scavenger with unique effects on cell membranes. Our bodies cannot synthesize astaxanthin. Doctor's Best Astaxanthin is derived from a solvent-free concentrate from green micro-algae which have the ability to biosynthesize astaxanthin very effectively. This action is linked to clinically-proven benefits for circulation, vision, immunity and muscle endurance. Helps support healthy blood flow and vessel integrity Helps promote healthy, integrated immune response May help maintain healthy vision Veggie softgels, made with a healthy gelatin-free alternative to suit your lifestyle