Yellow root is a little different than many other bitter plants because of it's characteristic astringency. This makes it specifically really great for working with stomach ulcers. And no- I'm not saying you should not seek medical treatment for stomach ulcers as they can be dangerous if untreated but their is really solid research on the effects of Xanthorhiza on H. Pylori the bacteria that causes stomach ulcers. It works very well in a tea form and you will notice a difference in a few days on