Doctor's Best Astaxanthin featuring AstaPure is an antioxidant that supports healthy blood flow and vessel integrity, promotes a healthy, integrated immune response, supports memory and other brain functions; it also enhances vision and relieves eye fatigue. Astaxanthin has beneficial effects on cell membranes that manage important life functions. The body cannot make astaxanthin. It is made by algae, and moves up the food chain when the algae are consumed as food. It gives the red color to seafood such as salmon, trout, crab, shrimp, lobster, and krill, but these sources of astaxanthin are not common in most diets. Doctor's Best is pleased to offer this nutrient in its natural form as AstaPure, a solvent-free concentrate from the microalga Haematococcus pluvialis. What is Astaxanthin? Astaxanthin is one of a class of natural pigments called carotenoids. It is commonly found in marine environments where it gives an orange-pink coloration to several species such as salmon, shrimp and.