What exactly are the key benefits of Astaxanthin located in Krill Oil? Astaxanthin is a brilliant-antioxidant current in Krill Oil. Microalgae inside the ocean create large amounts of astaxanthin which have been then ingested via the krill, offering them the pinkish coloring. Astaxanthin is actually a keto-carotenoid, like beta-carotene and lycopen