I saw an episode of the television show 'Victorian Pharmacy' where they explained the modern and historical medical uses of these creatures, and also demonstrat

I saw an episode of the television show 'Victorian Pharmacy' where they explained the modern and historical medical uses of these creatures, and also demonstrated it live on some poor guy. Apparently the ones used by hospitals are fed nothing for two whole years so that they are REALLY hangry when put to use. The leech vendor had a bucket of them and says he gets seven dollars apiece!