Considering the increasing interest in the last decades in elucidating the role of the daily diet in preserving the status health and preventing several degenerative diseases, based on the increased consumption of beverages and diminishing fresh fruit intake, it has become very important to ensure the proper assessment of presumed antioxidant properties of beverages. This challenge must be met before claiming and labeling a product as beneficial to consumers’ health. The present chapter presents several experimental critical points to be considered when beverages are assessed for their antioxidant properties, details on oxygen radical absorbance capacity (ORAC) assay and trolox equivalent antioxidant capacity (TEAC) being provided.