Hermetica Superfood Encyclopedia
Legacy index-continuity record: the score and narrative are provisional and must not be represented as validated or human-approved.
Review flags: AWAITING_SEMANTIC_VALIDATION
Da Huang (Rheum palmatum) is a traditional Chinese herb containing anthraquinones, primarily emodin and chrysophanol, that stimulates intestinal contractions. It functions as a purgative by increasing colonic motility and inhibiting water absorption in the intestinal tract.
Reported Benefits (Provisional)
Origin & History
Da Huang, or Rheum palmatum, is a species of rhubarb native to China. The roots are dried and used in herbal medicine.
Research Narrative (Provisional)
Scientific studies on Da Huang have shown its effectiveness as a laxative and its potential role in liver protection. Some RCTs support its use in treating constipation, but further research is needed.
Preparation & Dosage
Dosage guidance is withheld because the publication gate has not recorded adequate support for this profile.
Nutritional Profile
Da Huang (Rheum palmatum) is a medicinal herb rather than a dietary staple, so its nutritional profile is characterized primarily by bioactive compounds rather than macronutrients. Anthraquinones are the dominant bioactive class, comprising 2–5% of dry root weight, with emodin (0.1–0.5%), rhein (0.5–1.5%), aloe-emodin (0.05–0.3%), chrysophanol (0.1–0.4%), and physcion (0.05–0.2%) as the primary constituents; these are responsible for laxative and antimicrobial effects. Stilbene glycosides, particularly rhaponticin and resveratrol-related compounds, are present at approximately 0.5–1.0% dry weight and contribute anti-inflammatory activity. Tannins (primarily gallotannins and condensed tannins such as procyanidins) constitute 5–12% dry weight, lending astringent and hepatoprotective properties. Sennosides A and B are present at 0.5–2.0% and are primary drivers of cathartic activity. Phenolic acids including gallic acid (0.1–0.5%) and catechins are also documented. Regarding conventional macronutrients: crude fiber accounts for approximately 15–20% dry weight, crude protein approximately 8–12%, and moisture content in dried root is below 15%. Mineral content includes calcium (~800–1200 mg/100g dry weight), potassium (~1000–1500 mg/100g), magnesium (~150–250 mg/100g), and trace iron (~10–20 mg/100g). Bioavailability note: anthraquinone glycosides undergo hydrolysis by colonic microbiota to active aglycone forms; bioavailability is significantly influenced by gut microbiome composition. Tannins may reduce iron and protein bioavailability when co-ingested with food sources.
Reported Mechanism (Provisional)
Da Huang's anthraquinone compounds, particularly emodin and chrysophanol, stimulate myenteric plexus neurons to increase intestinal peristalsis. These compounds also inhibit Na+/K+-ATPase pumps in colonic epithelial cells, reducing water reabsorption and promoting bowel movements. Additionally, emodin modulates inflammatory pathways by inhibiting NF-κB activation and prostaglandin E2 synthesis.
Clinical Narrative (Provisional)
Limited clinical trials have evaluated Da Huang's efficacy, with most evidence derived from traditional use and animal studies. A small randomized controlled trial (n=60) showed Da Huang reduced constipation symptoms within 24-48 hours compared to placebo. Preliminary studies suggest hepatoprotective effects, but large-scale human trials are lacking. The evidence quality remains moderate due to small sample sizes and methodological limitations.
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