Distinguishable by its rich red color, astaxanthin is a powerful antioxidant from the carotenoid family. Its ability to cross the entire cell membrane means it is both water and fat soluble. Additionally, it can cross the blood-brain and blood-retinal barriers, offering anti-inflammatory and antioxidant protection to vital organs. With an enhanced ability to scavenge free radicals, its potential applications span sports nutrition and cognition to the health of the heart, eyes, immune system and skin. Takeaways include: *Astaxanthin can be esterified and features a more polar configuration than other carotenoids. *One study concluded astaxanthins antioxidant strength was 8,000 times more potent than vitamin C. *Bioavailability of astaxanthin varies, but may be improved when combined with lipids.