Science-Based Nutrition Dietary Supplement Vegan Non-GMO Gluten Free Helps Support Healthy Sinuses. Helps Breakdown Unwanted Proteins. Serrapeptase (serratio-peptidase) is a protein-digesting enzyme isolated from the friendly bacterium Serratia E-15 discovered in the Japanese silkworm. Doctor's Best High Potency Serrapeptase is formulated with Serrateric, a superior alternative to enteric coating that protects the individual enzyme until it reaches the intestine for optimal absorption.