Gu Jing Cao (Inflorscence or Pipewort Scapus)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Gu Jing Cao?

  6–15 g in decoction, using the flowering tops. That is the range held here, and it is a generous one for a flower — the material is very light, so 15 g is a substantial volume of dried heads.

  • Decoction — 6–15 g, per the recorded range.
  • Part used — the flowering tops. The officinal article in the modern pharmacopoeial literature is described as the dried capitulum with the peduncle, which matches the recorded Latin naming both the scape and the inflorescence.
  • Preparation — decocted with the rest of the prescription in the ordinary way; as a light flower it is not subjected to prolonged hard boiling.
  • Quality point worth knowing — a market survey found that most commercial material sold in Taiwan consisted of the flower head without the peduncle, and that the two forms differ measurably in chemical profile. What you get is not necessarily what the Latin name specifies (see research).

  Source: Sacred Lotus sources & references (recorded dosage range and part used, as held on file); definition of the officinal article and the market-form finding per PMID 28987371, PMC 9328884, DOI 10.1016/j.jfda.2017.01.002. Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Gu Jing Cao?

  Yes — one specific and unusual contraindication is recorded here: it should not be used in patients with blood deficiency. That is a genuinely distinguishing caution, and it is what separates Gu Jing Cao from Mi Meng Hua, the eye herb that is explicitly recorded as suiting deficiency presentations.

  • Blood deficiency — contraindicated. Recorded plainly on this site. In Chinese medicine the eyes depend on Liver blood; a dispersing, fire-draining herb given where the underlying problem is not enough blood will fail to help and may make dryness and dim vision worse.
  • Practical consequence — chronic dry, tired, dim-visioned eyes in a depleted patient are not this herb’s territory, even though “brightens the eyes” appears in its recorded actions. The action is aimed at removing an obstruction, not at nourishing.
  • Do not self-treat eye disease. A reference note about the setting rather than the herb: a red, painful eye, sudden floaters, or any deterioration in vision needs assessment by an eye-care professional. Sudden onset of spots or flashes in particular is a presentation for prompt attention. The traditional indications above are documented reference facts, not instructions for use.
  • Species identity — several other Eriocaulon species are used regionally under the same name and are chemically distinct (see research). Verification of supplied material is the practical safeguard.
  • Pregnancy — no traditional prohibition is recorded, and none was found in the sources that could be verified. Professional guidance is the appropriate route in pregnancy.

  Source: Sacred Lotus sources & references (the recorded blood-deficiency contraindication, and the Mi Meng Hua record for contrast, as held on file); category cautions per materia medica consensus, cross-referenced against multiple online sources; species substitution per PMID 21920689, DOI 10.1016/j.jpba.2011.08.033. Reference note, not a safety guarantee.

Chinese Herb Toxicity & Overdose

• Is Gu Jing Cao toxic?

  No toxicity is recorded for Gu Jing Cao, it is not classed among the toxic materia medica, and no poisoning reports, organ-toxicity findings or restricted-substance listings for Eriocaulon buergerianum were found in the sources that could be verified. Its known constituents are ordinary plant phenolics — flavonols, flavones, xanthones and naphthopyranones — rather than alkaloids or cardiac-active compounds.

  • Constituent classes — a comprehensive analysis characterised 72 compounds across this species and its substitutes: 37 flavonols, six flavones, four isoflavones, six xanthones, 14 naphthopyranones and three phenolic acids. Nothing in that profile flags a toxicological concern at medicinal doses.
  • The real risk is substitution, not the herb — several Eriocaulon species circulate under the same name with markedly different chemistry (see research). Adulteration is the documented quality problem for this herb.
  • The usual caveat — no formal toxicological or clinical safety evaluation of this herb exists in the literature that could be confirmed. Absence of reported harm is not the same as a safety assessment.

  Source: Sacred Lotus sources & references (this herb is not held as toxic or restricted); constituent classes and species substitution per PMID 21920689, DOI 10.1016/j.jpba.2011.08.033. Neutral reference facts — not a safety guarantee.

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Gu Jing Cao (Eriocaulon buergerianum)?

  Yes, though almost none of it is on the eye. The research on this herb is dominated by two things: chemistry, and the surprisingly serious problem of which plant is actually in the bag. There are no clinical trials, and no laboratory study of the traditional ophthalmic indication could be verified.

  • Which species you actually have — the biggest research theme. A 2012 analysis characterised 72 compounds across E. buergerianum and three species used as substitutes, and found the chemical profiles genuinely distinct: authentic E. buergerianum is rich in flavonols and naphthopyranones; E. cinereum in isoflavones and flavones; E. sexangulare in flavones; and E. faberi in xanthones. The authors were able to identify the true species in thirteen commercial batches on this basis. A separate 2017 survey of material sold in Taiwan found wide variation in both morphology and chemistry, that most of the material on sale was the flower head without its peduncle, and that samples differed from an authenticated reference specimen — concluding that further monitoring is necessary.
  • Constituents — flavonoids of the apigenin, hispidulin and jaceosidin series and their glucosides and coumaroyl glucosides, plus the naphthopyranone toralactone and its glycosides, have been isolated from the flower heads. A 2026 paper described further flavonol glycosides with α-glucosidase inhibitory activity.
  • Antibacterial activity — a 2008 phytochemical study isolated 24 compounds from the herb and tested them against Staphylococcus aureus; ten showed antibacterial activity, with minimum inhibitory concentrations from 32 to 256 µg/ml. Modest activity, and consistent with the herb’s traditional reputation for red, inflamed conditions.
  • Neuroprotection (animal and cell) — an ethanol extract protected PC12 cells and dopaminergic neurons in zebrafish against damage from the neurotoxin 6-hydroxydopamine, in a dose-dependent way, with the authors attributing the effect to inhibition of nitric oxide production and inducible nitric oxide synthase expression. Nothing to do with the eye, but it does confirm real antioxidant and anti-inflammatory activity.
  • Other preclinical directions — three new feruloyl glycerol glycosides isolated from the herb showed anti-fibrotic effects on hepatic stellate cells in 2023.
  • Conservation — a 2018 modelling study projected changes in the geographic range of the species under climate change, a reminder that this is a wetland plant with a specific habitat rather than a cultivated crop.

  Honest summary: the traditional eye indication is untested by modern research. What the literature does establish is that the herb contains a genuine, distinctive phenolic chemistry with measurable antioxidant, anti-inflammatory and antibacterial activity — and that identifying the correct species is a real and documented problem. All of the above is laboratory, cell and animal work, reported as context, not as a treatment claim.

  Sources: PMID 21920689, DOI 10.1016/j.jpba.2011.08.033 (chemical analysis of E. buergerianum and adulterating species; 72 compounds; authentication of commercial batches); PMID 28987371, PMC 9328884, DOI 10.1016/j.jfda.2017.01.002 (morphological and chemical analysis of market material); PMID 18191163, DOI 10.1016/j.phytochem.2007.11.014 (antibacterial phenolic components); PMID 12377234, DOI 10.1016/s0031-9422(02)00218-2 (flavonoids from the capitulum); PMID 41762023, DOI 10.1080/14786419.2026.2636162 (flavonol glycosides and α-glucosidase inhibition); PMID 21527031, PMC 3108929, DOI 10.1186/1749-8546-6-16 (neuroprotection in PC12 cells and zebrafish); PMID 35834727, DOI 10.1080/14786419.2022.2099387 (feruloyl glucuronopyranosyl glycerols, anti-fibrotic effect on hepatic stellate cells); PMID 29683551, DOI 10.1111/plb.12836 (species range under climate change). Research context, not a therapeutic claim.

Chinese Herb Notes

• How does Gu Jing Cao compare with the other eye herbs?

  Gu Jing Cao is the neutral one with a Stomach-channel reach — the eye herb for a red, obstructed eye that comes with wind-heat in the head and face rather than with blazing Liver fire. This site holds six herbs used for the eyes; they divide by how they reach the eye and by how cold they are. The comparison below is built from the site’s own identity records.

  • Gu Jing Cao (this herb) — sweet, neutral; Liver and Stomach; drains fire. The only one that is neutral rather than cold, and the only one that enters the Stomach. For visual obstruction, pterygium and spots before the eyes with wind-heat in the head and face. Contraindicated in blood deficiency.
  • Mi Meng Hua (buddleia flower bud) — sweet, cool; Liver only; drains fire. The gentle, nourishing one, and the one recorded as suiting both excess and deficiency patterns — the exact opposite of Gu Jing Cao’s blood-deficiency contraindication. That is the cleanest distinction in the whole group: for a dry, dim, depleted eye, Mi Meng Hua; for a hot, obstructed, excess eye, Gu Jing Cao.
  • Qing Xiang Zi (celosia seed) — sweet, cool; Liver; drains fire. The strongest of the group for Liver fire flaring upward into the eyes, and it also addresses ascendant Liver yang. It carries a traditional eye-specific restriction of its own (see its entry).
  • Jue Ming Zi (cassia seed) — bitter, sweet, cool; Liver, Kidney, Large Intestine; drains fire. The choice when the eye pattern comes with constipation and a heat-bound bowel.
  • Ju Hua (chrysanthemum) — sweet, bitter, slightly cold; Liver, Lung; a cool acrid exterior-releasing herb. Arrives from the exterior: wind-heat with red eyes, headache and fever. The closest to Gu Jing Cao in mechanism, and the two are conventionally used together where the pattern is wind-heat in the head.
  • Mu Zei (scouring rush) — sweet, bitter, neutral; Liver, Lung; a cool acrid exterior-releasing herb. Also neutral, and also directed at superficial visual obstruction with excessive tearing — the closest overlap with Gu Jing Cao on indication, differing by channel (Lung rather than Stomach) and by category route.

  Practical upshot. An acute red eye with fever and an exterior wind-heat picture points to Ju Hua; a hot, painful, Liver-fire eye points to Qing Xiang Zi or Jue Ming Zi; a chronic dim or dry eye in a depleted patient points to Mi Meng Hua; and superficial obstruction — pterygium, spots, a film over the eye — with wind-heat in the head and face is where Gu Jing Cao and Mu Zei sit. (Traditional differentiation, not treatment advice.)

  What is Gu Jing Cao combined with?

  It is used with the other Liver-and-eye herbs rather than alone — conventionally with Ju Hua and Mu Zei where wind-heat and superficial obstruction dominate, and with Bai Ji Li for spots and film over the eye. Because it is contraindicated in blood deficiency, the blood-nourishing eye herbs are not its natural partners; where the eye complaint is one of depletion, Mi Meng Hua with Gou Qi Zi is the pairing the tradition reaches for instead. No formula held on this site contains Gu Jing Cao, which reflects its status as a targeted adjunct rather than a formula chief. (Traditional combination context, not treatment advice.)

  Source: Sacred Lotus sources & references (the herb records for Gu Jing Cao, Mi Meng Hua, Qing Xiang Zi, Jue Ming Zi, Ju Hua, Mu Zei, Bai Ji Li and Gou Qi Zi — nature, flavour, channels, category and recorded cautions — as held on file); cross-referenced against multiple online sources and materia medica consensus.