Astaxanthin 2 mg 120 SoftgelsDietary Supplement Antioxidant Carotenoid Astaxanthin, a member of the carotenoid family, is a powerful antioxidant. In vitro research demonstrates that astaxanthin is 10 times stronger than other carotenoids such as lutein, zeaxanthin, and beta carotene, and 100 times stronger than alpha tocopherol. Astaxanthin has also been shown to prevent low density lipoprotein oxidation in human blood and to enhance the immune system in animal studies.