Natural Factors Zymactive Proteolytic Enzymes provides a spectrum of protein-digesting enzymes useful in supporting proper digestive function as well as nutritional support for individuals experiencing inflammation or cancer.Zymactive is a unique enzyme complex that is more than twice as potent in protein digesting activity as the leading brand. Peptizyme SP?, a proprietary enzyme referred to as the ?silk worm enzyme? has a more powerful and broader pH stability than chymotrypsin and trypsin.