Prescription and over-the-counter drugs can contain gluten, although most are gluten free. Check with the pharmaceutical company. Processed cheese (spray cheese, for example) may contain gluten. Real cheese is gluten free. Seasonings and seasoning mixes can contain gluten. Wheat will be noted on the label as required by law. Soy sauce is usually fermented from wheat. Only soy sauce made without wheat is gluten free. Look for soy sauce with a gluten-free label. Gluten: Special Cases