Disclosed in this application are compositions which include digestive enzymes and which are formulated to reduce one or more symptoms of Schizophrenia or a Schizophreniform Disorder. Also disclosed is a method for treating an individual with Schizophrenia or a Schizophreniform Disorder using digestive enzymes and their derivatives to alleviate the symptoms of Schizophrenia or a Schizophreniform Disorder. The method comprises administering to the individual an effective amount of digestive enzymes that are either naturally or recombinantly derived, or their derivatives, in an amount effective to reduce one or more symptoms of Schizophrenia or a Schizophreniform Disorder.