Exactly what are the main advantages of Astaxanthin present in Krill Oil? Astaxanthin is a super-antioxidant present in Krill Oil. Microalgae during the ocean produce substantial levels of astaxanthin which can be then ingested because of the krill, giving them the pinkish coloring. Astaxanthin is a keto-carotenoid, like beta-carotene and lycopene,