What are the key benefits of Astaxanthin located in Krill Oil? Astaxanthin is a super-antioxidant present in Krill Oil. Microalgae during the ocean deliver high amounts of astaxanthin which might be then ingested via the krill, giving them the pinkish coloring. Astaxanthin is actually a keto-carotenoid, like beta-carotene and lycopene, and is consi