Serrétia is made up of pure pharmaceutical grade serratiopeptidase, more commonly known as serrapeptase. Serrapeptase was discovered from the Serratia sp. E-15 micro-organism that lives within the intestines of silkworms. Silk is among the strongest natural proteins on earth. Silkworm larvae excrete the serrapeptase enzyme to dissolve their silk cocoons. Serrapeptase miraculously dissolves the tough silk protein fibers of the silk cocoon, yet has no effect on the silkworm’s living tissue.