Many protein shake powder mixes contain digestive enzymes such as protease, lipase, and cellulase. However, the products do not detail from which organism the proteins are produced or which protein homolog is used. I would imagine that the enzymes are produced in yeast or fungi. I am am curious regarding which organisms are used. Also, is the native form of the protein harvested from these organisms, or are they made to produce a recombinant human version? In the case of cellulase, there is no human homolog, so it must be from another organism. Regardless, should not the host species be listed on the product? Additionally, if the protein is not naturally occurring in humans, is it ever a good idea to consume it in high quantities?