Dr. Houston's Highest Quality Plant Enzymes Multi-Enzyme Product for Digestion of Food Proteins Including Gluten, Casein, and Soy Advanced Formula Protease Highest Quality Enzymes Support Digestion The Authority on Enzymes Dietary Supplement Vegetarian and Vegan Formula AFP-Peptizyde (Advanced Formula Protease) may be helpful for the digestion of food proteins (including gluten, casein, and soy). AFP-Peptizyde is high in DPP IV (dipeptidyl peptidase IV) activity, which aids in the breakdown of casomorphin (from casein) and gluteomorphin (from gluten). AFP-Peptizyde is papain-free and bromelain-free. AFP-Peptizyde was developed by Dr. Devin Houston, PhD enzyme biochemist.