Eucommia (Eucommia ulmoides), commonly known as “Du Zhong” in Traditional Chinese Medicine (TCM), has been used for centuries to support the structural system, which encompasses the bones, ligaments, and tendons. Historical documentation in classical TCM texts describes Eucommia bark as a key herbal remedy for strengthening bones and sinews, promoting flexibility, and aiding recovery from musculoskeletal injuries. Its traditional indications include alleviating lower back and knee pain, which are often attributed to “kidney deficiency” in TCM theory—a state believed to impact the health of the skeletal system.

Although some modern pharmacological studies have begun investigating Eucommia’s active compounds, such as lignans and iridoids, for their potential effects on bone metabolism, robust clinical trials in humans are limited. Preclinical research suggests that extracts of Eucommia may stimulate osteoblast (bone-forming cell) activity and inhibit bone resorption, indicating a possible beneficial effect on bone strength and density. However, these findings are preliminary, and most of the evidence for Eucommia’s role in supporting the structural system is based on well-established traditional usage rather than high-quality scientific validation.

In summary, Eucommia is primarily justified by traditional use for supporting the structural system, with moderate historical evidence and emerging but insufficient scientific support.