The present invention provides a composition for regulating blood sugar. Thecomposition comprises at least one yellow pigment extracted from a red moldproduct, wherein the said yellow pigment is Monascin, Ankaflavin, orcombinationof Monascin and Ankaflavin. Moreover, results of a variety of animalexperimentshave proved that this blood sugar regulating composition indeed possess thefunctionalities of: lowering Hyperglycemia induced by high energy diet,alleviatingROS and inflammatory caused by the Hyperglycemia, reduce AST and ALT valueof liver as well as sarcosine value of kidney.