Polymorphic and amorphous forms of Rebaudioside X and methods for preparing the same are provided herein. Also provided herein are Rebaudioside X complexes and methods for preparing the same. Sweetener compositions and sweetened compositions comprising Rebaudioside X forms and Rebaudioside X complexes are described, as well as and methods of their preparation. Methods of improving the flavor and/or temporal profile of sweetenable compositions, such as beverages, are also provided herein.
