Bai Ji (Rhizoma Bletillae) is a traditional Chinese medicinal herb primarily known for its use in stopping bleeding and promoting wound healing, especially for gastric and pulmonary hemorrhage. Its traditional uses are well documented in classical Chinese materia medica, where it is not commonly associated with the treatment of nephritis (inflammation of the kidneys). However, some traditional Chinese medicine (TCM) formulations for renal disorders may occasionally include Bai Ji, generally for its purported astringent properties and ability to "cool the blood," rather than for direct anti-inflammatory or nephroprotective actions.

Scientific research on Bai Ji’s effects specifically for nephritis is extremely limited. There are few, if any, peer-reviewed studies directly evaluating its efficacy or mechanisms in nephritis models. Most of the available scientific literature focuses on its hemostatic, anti-inflammatory (in the context of wounds), and mucosal repair activities, rather than renal inflammation or glomerular injury. Thus, its use for nephritis is rooted in traditional practice, and its supporting evidence is weak and indirect. Contemporary TCM practitioners may include it as part of a broader multi-herb formula, but not as a principal agent for nephritis itself.

In summary, Bai Ji’s use for nephritis is justified primarily by tradition, with minimal direct scientific or clinical evidence supporting this indication.