Look, here in Greece there is a person who produces juice from this plant(bulb). I don't know if it can be found on the market.But once i went to him to treat my U colitis I saw the juice and discussed about it. He told me that I don't use it because I have flare up. He didn't know about polyps.He just use it for cancer patients. (I read this remedy on my own in an old Greek book, that's all). Good Luck on your research.