ADVANCED SYSTEMIC ENZYME: Serrapeptase (known as Serratiopeptidase) is a powerful, proteolytic enzyme derived from silkworms known for its fibrinolytic properties (to support normal fibrin metabolism).* ACID-RESISTANT: Our Serrapeptase has a completely phthalate-free polymer applied to maximize efficacy.* RANGE OF USE: Promotes beneficial immune cell response, and healthy respiratory and sinus function. Supports muscle, joint, and overall body/tissue health.* ACHIEVE OPTIMUM HEALTH NATURALLY: An all-natural enzyme such as Serrapeptase supports a healthy response to inflammation to restore balance.* QUALITY ASSURED & ALLERGEN FRIENDLY: All products by AST Enzymes are manufactured in the USA. Free of wheat, egg, milk, soy, tree nuts, peanuts, fish, shellfish, and sesame. What is the benefit of using acid-resistant Serrapeptase? AST’s Serrapeptase contains Peptizyme SP EN, which is specially formulated with an acid-resistant polymer which helps protect the delicate enzyme from the acidic conditions of the stomach, allowing delivery of significantly more enzyme activity to the small intestine, maximizing efficacy.* The cutting-edge, phthalate-free polymer applied to Peptizyme SP EN is the food-grade compound Methacrylic Acid Copolymer (MAAC). MAAC is gastro-resistant to withstand stomach acidity. AST Enzymes is a research-driven enzyme and probiotics manufacturer bringing you science-backed, expertly formulated supplements. We don’t just buy ingredients in the market and resell to you. We are a vertically integrated part of the company that manufactures these ingredients from scratch, giving us unique insight and control over quality. We have more than 50 years of enzyme experience, and our Master enzymologist and formulator created many of the original systemic enzyme formulas on the market today. Made in NSF-certified facilities, our ingredients and products undergo rigorous quality testing at every step of the process.