the above results, based upon purely clinical observations, would seem to support Allen's view that blueberry leaf extract has a stabilizing influence upon the carbohydrate tolerance of certain cases of diabetes. that is cannot take the place of insulin need not be gainsaid. but if it can be shown to permit to dosage or frequency of administration of insulin to be decreased,or cases, or allow for added carbohydrate intake without increasing insulin,its use is justified. judgment regarding the value of a therapeutic agent of this sort is truly difficult and one must weight the evidence carefully before arriving at conclusion.