The present invention relates generally to functional sweetener compositions comprising non-caloric or low-caloric high-potency sweeteners and methods for making and using them. In particular, the present invention relates to different functional sweetener compositions comprising at least one non-caloric or low-caloric natural and/or synthetic high-potency sweetener, at least one sweet taste improving composition, and at least one functional ingredient, such as an agent for the treatment and/or prevention of autoimmune disorders. The present invention also relates to functional sweetener compositions and methods that can improve the tastes of non-caloric or low-caloric natural and/or synthetic high-potency sweeteners by imparting a more sugar-like taste or characteristic. In particular, the functional sweetener compositions and methods provide a more sugar-like temporal profile, including sweetness onset and sweetness linger, and/or a more sugar-like flavor profile.