Euryale (Euryale ferox), commonly known as fox nut or "Qian Shi" in Traditional Chinese Medicine (TCM), has a long-standing history of use in supporting kidney health. In TCM, the kidneys are considered a foundational organ responsible for reproductive health, vitality, and fluid balance. Euryale seeds are traditionally classified as having a sweet and astringent flavor, with neutral thermal properties. They are used to "tonify" the kidneys and spleen, stabilize essence, and stop leakage (such as excessive urination or seminal emission).

The traditional rationale for using Euryale to support the kidneys is based on its perceived ability to strengthen and stabilize kidney function, particularly in cases of deficiency syndromes. However, scientific validation for these kidney-supporting claims is limited. While preclinical studies have examined Euryale's antioxidant, anti-inflammatory, and antidiabetic properties, direct evidence from clinical trials demonstrating a beneficial effect on human kidney function is sparse or lacking.

In summary, Euryale's use for kidney support is primarily rooted in traditional herbal practice rather than rigorous modern scientific evidence. Its longstanding use in TCM prescriptions and materia medica supports its traditional reputation, but more targeted research would be needed to scientifically validate its efficacy for kidney health.