Natural Factors Astaxanthin 6 mg contains a 100% natural form of astaxanthin sourced from microalgae. Astaxanthin is a fat-soluble carotenoid pigment best known for its high antioxidant ability. As a source of antioxidants, it helps protect against the oxidative damage caused by free radicals. These convenient, one-per-day softgels contain a higher potency of astaxanthin than our previous carotenoid formulas. This formula is non-GMO and delivered in a base of flax oil for easy absorption.