I would suggest that Anne Rutherford contact the provincial Food & Drug Directorate in Canada, or if that is not satisfactory, contact the federal just outside Ottawa. For those in the US, one of the district FDA offices should be able to help, especially the one where the manufacturer is located. Practically all formulated medications are combined with a great variety of excipients (starch, talc, sugar, colorants, etc.) and the manufacturer cannot anticipate allergies to any or all these inactive materials, but in adverse case, they might prepare special formulations. I've heard of gluten allergy but never of cornstarch, but my knowledge is admitedly limited. Good luck Michel Margosis