Slippery Elm (Ulmus rubra) has a long history of use in traditional herbal medicine, particularly in North America. Its inner bark is known for its mucilaginous properties, which are soothing and demulcent to mucous membranes. In traditional herbal practice, Slippery Elm has been used for a range of conditions involving mucosal irritation and inflammation, such as sore throats, coughs, and digestive complaints. Its use for leucorrhea—a condition characterized by abnormal vaginal discharge—can be traced to traditional herbal and folk remedies. Herbalists attributed its benefits to its ability to soothe irritation in the vaginal and reproductive tract mucosa.

However, there is very limited scientific evidence to support the efficacy of Slippery Elm for leucorrhea. Most references to its use for this condition are found in older herbal texts and ethnobotanical records rather than modern clinical studies. There are no substantial randomized controlled trials or peer-reviewed studies that directly confirm its effectiveness for managing leucorrhea. The theoretical rationale is based on its general mucilaginous and soothing action, but not on condition-specific research.

In summary, the use of Slippery Elm for leucorrhea is justified primarily by traditional and historical usage rather than scientific validation. The overall evidence rating is low due to the lack of modern clinical research.