In 2004 the disgusting and lowly leech was elevated to healer status. The bloodsuckers had been used for primitive bloodletting for centuries, but that year, the FDA cleared leeches for commercial prescription medical use. Modern uses of leeches include using them to improve circulation and prevent blood clots during skin grafts and surgeries to reattach body parts, as well as therapy for cardiovascular disease and cancer.
Most beer naturally takes a long time to "clear," or for the particulate matter to settle to the point where it's not hazy. Add isinglass, the swim bladder of fish like sturgeon, and the problem is solved. Many breweries in the U.K. do this, much to the chagrin of vegetarians who didn't know they were drinking animal organs every time they cozied up with a pint.