Shui Xian Cao

Shui Xian Cao is the dried aerial parts of Oldenlandia corymbosa (L.) Lam., a small annual or perennial herb in the family Rubiaceae. In the traditional TCM classification system, Shui Xian Cao is considered sweet and slightly bitter in flavor with a cool nature. It enters the Liver, Lung, and Large Intestine meridians, giving it a role in formulas that address Heat-toxin patterns, Damp-Heat in the Lower Burner, and inflammatory conditions.

Botanical description: O. corymbosa is a slender, diffusely branched annual herb, typically 15–40 cm tall. The stems are slender, angular, and often prostrate at the base. The leaves are opposite, sessile, linear-lanceolate to narrowly elliptic, 1–3 cm long and 2–5 mm wide, with a single midrib and entire margins. The inflorescence is a corymbiform cyme, with tiny white flowers, each about 3–4 mm in diameter, with a funnel-shaped corolla. The fruit is a small capsule containing numerous tiny seeds.

Habitat and distribution: O. corymbosa is widely distributed across tropical and subtropical regions of Asia, Africa, and the Americas. In China, it is found throughout the southern provinces, including Guangdong, Guangxi, Fujian, Yunnan, Guizhou, Sichuan, Hunan, and Jiangxi. It commonly grows in fields, along roadsides, and in waste areas.

Quality markers: High-quality Shui Xian Cao should consist of intact aerial parts with green stems and fresh leaves. The material should be clean, free of mold.

In the traditional Chinese medicine theoretical framework, Shui Xian Cao is understood in terms of its effects on specific patterns of disharmony (zheng). Because Shui Xian Cao enters the Liver, Lung, and Large Intestine meridians and has a sweet, slightly bitter, and cool quality, it is traditionally indicated for patterns involving Heat-toxin, Damp-Heat, and inflammatory conditions.

Clearing heat and resolving toxicity: Shui Xian Cao is traditionally used to clear Heat and resolve toxic accumulation. It is commonly combined with Jin Yin Hua and Lian Qiao for enhanced Heat-clearing effects.

Promoting urination and resolving Damp-Heat: Shui Xian Cao has a traditional affinity for the urinary system and is used to promote urination and resolve Damp-Heat in the Lower Burner, presenting as painful, frequent, or difficult urination.

Reducing swelling: Shui Xian Cao is traditionally applied for conditions involving swelling and inflammation, such as enlarged lymph nodes, abscesses, and traumatic swellings.

Classical and regional references: Shui Xian Cao is primarily recorded in the folk medicine and regional herbal traditions of southern China. The Guangxi Zhong Yao Zhi documents its traditional uses. It is often used interchangeably with Bai Hua She She Cao.

Shui Xian Cao contains a range of bioactive compounds that have been the subject of pharmacological investigation.

Ursolic acid: Ursolic acid is a pentacyclic triterpenoid and one of the most studied compounds in Shui Xian Cao. It has been investigated for anti-inflammatory, antioxidant, hepatoprotective, and potential antitumor activities in pre-clinical models.

Oleanolic acid: Oleanolic acid shares similar hepatoprotective and anti-inflammatory properties. Pre-clinical studies have demonstrated hepatoprotective effects against various chemical-induced liver injury models.

Flavonoids: Shui Xian Cao contains quercetin, kaempferol, and their glycoside derivatives, studied for antioxidant, anti-inflammatory, and potential immunomodulatory effects.

Anthraquinones: Anthraquinone compounds identified in Shui Xian Cao may contribute to its traditional use for resolving toxicity and promoting elimination.

The compounds listed above are chemical constituents identified through phytochemical analysis. Their pharmacological activities are based on pre-clinical studies and do not represent confirmed clinical effects in humans.

Shui Xian Cao is primarily used in folk and regional TCM practice, often in combination with related Oldenlandia species.

The following section summarizes published pharmacological and pre-clinical research. Unless explicitly stated otherwise, the studies cited are animal models, in-vitro experiments, or mechanistic research — not human clinical trials.

Anti-inflammatory activity of ursolic acid: Ursolic acid has been shown to inhibit NF-kappaB activation, reduce COX-2 and iNOS expression, and decrease pro-inflammatory cytokine production in pre-clinical models.

Hepatoprotective effects: Both ursolic acid and oleanolic acid have demonstrated hepatoprotective activity in animal models of chemically induced liver injury, including CCl4 and acetaminophen-induced models.

Potential antitumor mechanisms: Pre-clinical studies on extracts of O. corymbosa have reported cytotoxic effects against various cancer cell lines in vitro. These findings are preliminary and from in-vitro or animal models only. Shui Xian Cao should NOT be used as a cancer treatment.

What the research does NOT show: Despite promising pre-clinical signals, the research on Shui Xian Cao does NOT demonstrate conclusive clinical efficacy for any specific disease in humans. This page does not endorse Shui Xian Cao as a treatment for any condition.

Important: All pharmacological effects described above are based on pre-clinical studies. They do not constitute evidence of clinical efficacy in humans.

General safety profile: Shui Xian Cao is generally considered to have a favorable safety profile when used appropriately at standard doses. It is not classified as a toxic herb.

Spleen-Stomach deficiency-cold: Individuals with Spleen-Stomach deficiency-cold patterns should use Shui Xian Cao with caution, as its cooling nature may worsen digestive weakness.

Pregnancy and lactation: Self-administration during pregnancy is not recommended.

Drug interactions: Ursolic acid and oleanolic acid may affect hepatic cytochrome P450 enzymes. The herb's diuretic properties may have additive effects with pharmaceutical diuretics. Consult a qualified healthcare professional before combining with medications.

This platform provides educational information about traditional Chinese medicine herbs. It does not recommend, endorse, or prescribe the use of Shui Xian Cao for any condition.