Astaxanthin

Astaxanthin is a powerful, naturally occurring carotenoid pigment that's found in certain marine plants and animals. Often called "the king of the carotenoids," astaxanthin is recognized as being one of the most powerful antioxidants found in nature. It is of particular significance, because unlike some other types of antioxidants, astaxanthin never becomes a pro-oxidant in the body so it can never cause harmful oxidation.