Today's consumer is bombarded with many products touting high antioxidant levels. How does one know if this is true? Furthermore, how does one know if this is of any benefit? This session will discuss some of the evaluation schemes that can be used to determine the answer to both of these questions. Topics will include discussion of in vitro and in vivo techniques, as well as myriad chemical tests, such as oxygen radical absorbance capacity (ORAC), 2,2-diphenyl-1-picrylhydrazyl (DPPH), tetraethylammonium chloride (TEAC), and so on.