O2 THE MAX tm is a clear liquid in a two ounce dropper bottle. O2 THE MAX tm contains highly stabilized sodium chlorite. It is stable because unlike plain chlorine or sodium chloride, sodium chloride is metabolized into chlorine dioxide, which has the ability to go through the reduction-oxidation ("redox") cycle many, many times. The metabolites of the redox cycle are believed to be utilized by the body as a substrate for peroxidase enzymes, which enhances the body's natural defense system to fight free radicals.