Slippery elm is a North American species of tree. Various Native American tribes used the bark for food during times of scarcity, usually by making a cereal or porridge similar to oatmeal. They also used the bark to make infusions to address respiratory issues.
Contemporary use of slippery elm bark includes using the herb to make teas, tinctured and liquid extracts. Slippery elm bark powder is usually encapsulated as a dietary supplement, although it can also be added to foods.