Serrapeptase (serratio-peptidase) is a protein digesting enzyme isolated from the friendly bacterium Serratia E-15 discovered in the Japanese silkworm and has been used as a nutritional supplement in Europe and Asia for over three decades. Doctor?s Best Serrapeptase 40 000 SPU is formulated with Serrateric? a superior alternative to enteric coating that protects the individual enzyme until it reaches the intestine for optimal absorption.* At Doctor?s Best we lead with science. Our products are backed by research and crafted using pure ingredients carefully sourced from around the globe. Since 1990 we have dedicated ourselves to providing highly effective nutritional supplements that enable you to live a healthier lifestyle. We want nothing more than to see you and your family thrive!