Bonvit Slippery Elm Bark powder (Ulmus rubra Muhl) is 100% from the inner bark, is wildcrafted from the United States and is certified Kosher and Halal. There are no fillers, flavours, preservatives, colours or sweeteners and it is gluten free. Bonvit Slippery Elm Bark powder is 100% Natural, Non-GMO, Gluten free and has NO preservatives.