Slippery Elm Bark Powder by Heritage Store 4 oz Powder Slippery Elm Bark Powder 4 oz Powder In many readings Edgar Cayce recommended adding a pinch of this herb to water to soothe the digestion and the walls of the intestines for improved well-being. Native to America slippery elm has long been used to ease irritation of the throat upper respiratory passages and muccous membranes. Ulmus fulva powdered. Warnings Keep out of reach of children. As with all dietary supplements consult your healthcare professional before use. See product label for more information.