How does Astaxanthin work? Astaxanthin like that found in Caruso's UltraMAX Astaxanthin is designed to protect all parts of thecell. Its structure is similar to all other human cell membranes which allows the Astaxanthin molecule to link precisely into theshape of the cell wall making it a perfect antioxidant to protect against cellular damage. It offers protection from free radicalson both the inside and outside of the cell.