I've been taking serrapeptase (more properly: serratiopeptidase) for about three weeks now.
I prefer to use a local vendor, but ours almost didn't remember they had it. Apparently it's not on the list of current fads, because virtually no one asks for it much. But they had three different versions and we chose something from Now Foods. Digging through the various advocates of this stuff, I decided to try taking it on an empty stomach, some minutes before eating breakfast.