E-Fong Xi Xian Cao by Baicao Pharmaceuticals is a traditional Chinese herbal supplement made from the aboveground parts of Siegesbeckia, a plant used in traditional Chinese medicine. The herb is traditionally used to support joint mobility and ease discomfort associated with patterns described in Chinese medicine as wind-dampness. It is supplied as concentrated herbal extract granules with a 5:1 extraction ratio, meaning the extract is concentrated from a larger quantity of raw herb. The 100 g bottle offers a convenient format for traditional herbal preparations. Scientific evidence supporting its effectiveness and long-term safety in humans remains limited.