Bai Hua She SheCao
StarHedyotis diffusa Willd.
Traditionally used for
- Urinary & fluids
- Skin
Cautions & contraindications
- Pregnancy
☯ TCM Properties
Clears Heat, strongly relieves Fire toxins and reduces abscesses (internally and topically); Clears Heat and promotes urination
Traditional Chinese Uses
Bai Hua She She Cao is the whole herb of Hedyotis diffusa (syn. Oldenlandia diffusa, Rubiaceae), a bitter-sweet, cold herb that clears Heat and vigorously resolves Fire toxicity. It is a leading remedy for hot toxic sores, carbuncles, and abscesses—used both internally and as a topical poultice—and classically for intestinal abscess (appendicitis) and snakebite, often combined with Zi Hua Di Ding, Lian Qiao, and Ye Ju Hua. By clearing Heat and promoting urination it also drains Damp-Heat from the lower burner in hot, painful urinary dribbling. Broadly cooling across many channels, it is paired with Ban Zhi Lian (Scutellaria barbata) in contemporary formulas used as an adjunct in cancer care, where it is a widely studied toxin-resolving herb. Doses are relatively large (15-60 g decocted). Its cold nature makes it unsuitable for Cold-Deficiency patterns, and it is used cautiously in pregnancy.
Relationships
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Botanical Description
Hedyotis diffusa (synonym Oldenlandia diffusa) is a small, slender annual herb of the Rubiaceae, widespread on damp, sandy, or sunny disturbed ground across South and East Asia. It grows 15–50 cm tall, the prostrate to weakly ascending, four-angled stems branching diffusely from the base. Opposite, linear-lanceolate sessile leaves, 1–3 cm long and only 1–3 mm wide, are paired with persistent membranous interpetiolar stipules. Solitary (occasionally paired) tiny four-lobed white funnelform flowers about 2 mm across arise on filiform pedicels from the leaf axils, followed by small flattened-globose capsules. The entire above-ground plant, gathered fresh in summer or autumn while in flower and fruit, is the medicinal organ. It is dried in shade for storage. The species is morphologically delicate but is collected in commercial quantity for the modern Chinese oncology adjunct trade.
Active Constituents
(E)-6-O-(p-Coumaroyl) scandoside methyl ester
Iridoid glycosideA cinnamoylated iridoid glycoside proposed as the quality-control marker for this drug because it is specific to the genuine species and absent from the common adulterants. Earlier proposed markers such as asperuloside and scandoside methyl ester occur at high concentration in Hedyotis corymbosa and so cannot distinguish the two.
Asperuloside
Iridoid glycosideOne of the iridoids of the herb, but present at high concentration in the adulterant Hedyotis corymbosa as well, so its presence in a sample says nothing about authenticity.
Scandoside methyl ester
Iridoid glycosideA characteristic iridoid of the Hedyotis group. Like asperuloside it is shared with adulterant species and is unsuitable as an identity marker.
2-Hydroxy-3-methylanthraquinone
AnthraquinoneOne of some two dozen anthraquinones reported from the herb and among the constituents most often studied for antiproliferative activity in cancer cell lines. The evidence is cell-culture and rodent-xenograft work only.
Ursolic acid
Pentacyclic triterpene acidA triterpene constituent widely credited with the antiproliferative and anti-inflammatory effects attributed to the herb in preclinical work. It is not specific to this species and is present in many plants.
Oleanolic acid
Pentacyclic triterpene acidThe oleanane isomer of ursolic acid, reported alongside it in the herb and with a comparable preclinical profile.
Quercetin
FlavonolPresent with kaempferol and their glycosides among the roughly 26 flavonoids described from the herb; these account for much of the antioxidant activity of aqueous and alcoholic extracts.
⚠ Drug Interactions
Hedyotis corymbosa (Shui Xian Cao) and Hedyotis tenelliflora sold as Bai Hua She She Cao
Hedyotis corymbosa and Hedyotis tenelliflora are documented market adulterants that are very hard to tell from Hedyotis diffusa morphologically once dried, and Hedyotis brachypoda is also reported. Chloroplast genome sequencing and DNA barcoding have been developed specifically to separate them, and a species-specific iridoid marker was proposed because the older chemical markers are shared. Since almost all of the published pharmacology names Hedyotis diffusa, material that is actually a congener has no evidence base at all.
Clinical note: Buy from suppliers who can document species identity. This is the single most important quality issue with this herb; it is far better characterised than any pharmacological interaction.
Cytotoxic chemotherapy and targeted anticancer agents
Hedyotis diffusa injection and decoctions are used adjunctively with chemotherapy in China, and the herb's constituents modulate apoptosis, angiogenesis and immune signalling in cell and animal models. But no controlled human study has measured whether the herb changes the exposure or the toxicity of any chemotherapeutic agent, and the reviews that describe the anticancer mechanisms are reviews of preclinical work. Treat any claim of a specific interaction, helpful or harmful, as unsupported.
Clinical note: Disclose use to the treating oncologist and do not present the herb as an evidence-based adjunct. Where a patient is in a trial or on a narrow-therapeutic-index agent, leave it out.
Pregnancy (not a drug interaction, but the standard caution for this herb)
Standard clinical references advise caution in pregnancy for this herb, which is used in large doses (15-60 g, and higher in oncology practice). There is no human reproductive safety data and the routine cancer-adjunct dosing is far above the doses characterised in the available toxicology.
Clinical note: Avoid in pregnancy. Note also that the only long-term toxicology available is for a three-herb hospital preparation rather than for Hedyotis diffusa alone.
Evidence Tier
Strong evidence · 5 studiesRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
2
1 verified · 1 unverified
Show 2 studies
- Antitumor potential of Hedyotis diffusa Willd: A systematic review of bioactive constituents and underlying molecular mechanisms
- Effect of heat-clearing and dampness-eliminating Chinese medicine for high-risk cervical cancer papillomavirus infection: a systematic review and meta-analysis of randomized controlled trials
Randomized controlled trial
0
Other clinical trial
0
Observational / case report
0
In vitro / animal
3
0 verified · 3 unverified
Show 3 studies
- Toxicity study of compound granules of Hedyotis diffusa: Acute toxicity and long-term toxicity
- Differentiation of Hedyotis diffusa and Common Adulterants Based on Chloroplast Genome Sequencing and DNA Barcoding Markers
- Proposal of a new chemical marker for the quality control of the herb Scleromitrion diffusum
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Some DOIs on this page have not been checked against the registries yet; their studies count as unverified until they are.
Clinical Studies
Antitumor potential of Hedyotis diffusa Willd: A systematic review of bioactive constituents and underlying molecular mechanisms
A systematic review of 58 antitumour-active components isolated from Hedyotis diffusa - iridoids, flavonoids, flavonol glycosides, anthraquinones, phenolic acids and derivatives, sterols and volatile oils - and of the mechanisms attributed to them, including inhibition of proliferation, induction of apoptosis, effects on angiogenesis, immune modulation, anti-inflammatory and antioxidant action and protective autophagy. The included evidence is in vitro and in animals: this review does not synthesise controlled human outcome data, and readers should not read its conclusions as clinical efficacy.
Effect of heat-clearing and dampness-eliminating Chinese medicine for high-risk cervical cancer papillomavirus infection: a systematic review and meta-analysis of randomized controlled trials
Twelve randomised controlled trials with 1,574 patients were pooled. Heat-clearing, damp-eliminating Chinese medicine gave higher HPV clearance than interferon (RR 1.40, 95 percent CI 1.15-1.71) and than follow-up alone (RR 3.15, 95 percent CI 2.43-4.08), a greater reduction in HPV DNA load, and a higher CIN reversal rate than follow-up (RR 2.80, 95 percent CI 2.19-3.57). Bai Hua She She Cao (Hedyotis diffusa) was among the most frequently used herbs, together with Huang Bai, Ku Shen, Da Qing Ye and Zi Cao. This is evidence about multi-herb formulas, not about Hedyotis diffusa as a single agent, and the included trials are small and mostly Chinese-language with the usual risk-of-bias concerns for this literature.
Toxicity study of compound granules of Hedyotis diffusa: Acute toxicity and long-term toxicity
Acute toxicity in KM mice gave a maximum tolerated dose above 45.072 g/kg with no poisoning signs. In a 28-day study, SD rats given 10, 20 and 50 times the human clinical dose showed reduced body weight and food intake, especially males, plus alterations in coagulation function and effects on the liver, while routine haematology, liver and kidney function, glucose and lipid metabolism and ion metabolism were not significantly disturbed. The authors concluded the preparation is non-toxic or of low toxicity but flagged coagulation and liver monitoring. Note that the test article is a three-herb hospital preparation (Hedyotis diffusa with Smilax china and Solanum lyratum), so it does not characterise Hedyotis diffusa alone.
Differentiation of Hedyotis diffusa and Common Adulterants Based on Chloroplast Genome Sequencing and DNA Barcoding Markers
Complete chloroplast genomes were sequenced for Hedyotis diffusa and its common market adulterants, and DNA barcoding markers were developed to tell them apart, on the grounds that the dried herbs are too morphologically similar to separate reliably by eye.
Proposal of a new chemical marker for the quality control of the herb Scleromitrion diffusum
The authors show that asperuloside and scandoside methyl ester, previously proposed as markers for this herb, are present at high concentration in the adulterant Hedyotis corymbosa and therefore cannot establish identity, and propose (E)-6-O-(p-coumaroyl) scandoside methyl ester instead as a marker specific to the genuine species. Hedyotis corymbosa and Hedyotis tenelliflora are named as the two common adulterants. The paper uses the current accepted name Scleromitrion diffusum for Hedyotis diffusa.
Historical Texts
Guang Xi Zhong Yao Zhi (Records on Chinese Herbs of Guangxi)
Modern, People's Republic of China (1950s)References
- Chen R, He J, Tong X, Tang L, Liu M. The Hedyotis diffusa Willd. (Rubiaceae): A Review on Phytochemistry, Pharmacology, Quality Control and Pharmacokinetics . Molecules (2016) [DOI]
- Wang C, Zhou X, Wang Y, Wei D, Deng C, Xu X, Xin P, Sun S. The Antitumor Constituents from Hedyotis Diffusa Willd . Molecules (2017) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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