An aspartame-containing acidic beverage is disclosed, which comprises a polymerized polyphenol at a concentration of 0.010% by weight to 0.100% by weight and aspartame at a concentration of 0.04% by weight or more, wherein a pH of the acidic beverage is 2 to 5, wherein the polymerized polyphenol may be selected from a group consisting of oolong tea polymerized polyphenol, black tea polymerized polyphenol, grape seed polymerized polyphenol, pine bark polymerized polyphenol or mixture thereof.
