At KS Mushroom Store, all of our mushrooms are grown in hay, straw or wood. Our caffeinated Stress Reducer Chaga Coffee is a healthy way to start your day. Chaga mushrooms provide a natural immune system boost and are a nutrient-dense, antioxidant-rich mushroom known to improve cardiovascularand skin healh. With a smoth flavor and rich aroma, it has everything you'd want in a cup of ciffe, plus a little more.