BioCore®DPP IV Helps Digest Gluten and Cereal Grains* Gluten Digest, with BioCore® DPP IV, is a comprehensive enzyme blend formulated to promote the complete digestion of cereal grains.* DPP IV (Dipeptidyl peptidase IV) is a unique enzyme with specific activity against the characteristic proline bonds found in cereal grain proteins.* Gluten Digest also includes proteases and amylases that address other protein and carbohydrate components that commonly co-occur in these foods.* BioCore® DPP IV is a registered trademark of Deerland Probiotics & Enzymes, Inc.