Wang Bu Liu Xing (Vaccaria Seeds)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Wang Bu Liu Xing?

  Roughly 4.5–10 g in decoction — 4.5–9 g is the range recorded here from Bensky and 6–10 g from Chen & Chen. The seeds are small, hard and shiny, and they are stir-fried until they pop open before decocting; unbroken seeds give up very little to the water.

  • Stir-fried until it bursts (chao Wang Bu Liu Xing) — the standard preparation. The heat splits the seed coat, which is what makes the interior extractable.
  • Wine-processed forms — wine-steamed vaccaria is used traditionally where the blood-moving action is what is wanted most; modern chemical work has compared the raw and wine-steamed material and found the two differ in their marker constituents, which supports the traditional distinction between the preparations.
  • Externally, as ear seeds — vaccaria seeds are the seeds most commonly taped to auricular acupuncture points for auricular acupressure. That is an entirely separate use from the decocted herb, with no oral dose involved.

  Source: Sacred Lotus sources & references (recorded Bensky and Chen & Chen ranges); preparation conventions per materia medica consensus, cross-referenced against multiple online sources; raw versus wine-steamed marker comparison per PMID 37666377. Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Is Wang Bu Liu Xing safe in pregnancy?

  No — it is contraindicated in pregnancy, and that is the most important thing recorded about it. The reasoning is the herb’s own defining quality: a strong, downward-driving, blood-moving action is exactly what should not be applied to a pregnancy. The note held here is that its bitterness induces a strong downward direction and that it can initiate labour.

  The full set of recorded cautions:

  • Pregnancy — contraindicated. Do not use.
  • Heavy menstrual bleeding (hypermenorrhea) — avoid. A blood-mover will increase what is already excessive.
  • Any excessive bleeding — avoid, for the same reason.
  • Deficient patients — use with caution. The herb consumes rather than supplements, and a weak patient tolerates it poorly.

  A note on the lactation use. The herb is traditionally given to nursing mothers, so pregnancy and breastfeeding must not be run together in the reader’s mind: the contraindication attaches to pregnancy specifically. That said, no controlled human safety data exist for the herb during breastfeeding, and the NIH lactation database records that no well-performed English-language clinical trial of oral vaccaria seeds as a galactogogue has been reported. Use during breastfeeding is a matter for a qualified practitioner, not self-prescription. Persistent low milk supply also has causes that need proper assessment rather than a herb.

  Source: Sacred Lotus sources & references (recorded cautions: pregnancy, hypermenorrhea, excess bleeding, caution in deficiency; recorded note on initiating labour); cross-referenced against multiple online sources and materia medica consensus; lactation evidence status per the NIH Drugs and Lactation Database (LactMed) record for Vaccaria, PMID 37094052. Reference note, not a safety guarantee.

Chinese Herb Toxicity & Overdose

• Not classified as a toxic herb, and no dose ceiling is recorded on that basis. Vaccaria seed is used at ordinary decoction doses without a toxicity designation in the sources reviewed, and the practical limits on its use are its contraindications — pregnancy and active bleeding — rather than a toxic constituent.

  One point belongs on the record neutrally. Vaccaria contains triterpenoid saponins, and cytotoxic triterpenoid saponins have been isolated from the seed and characterised in laboratory assays. Saponins are a common constituent class in the carnation family and are recognised as irritant at concentration; this is isolated-compound chemistry in cell assays, not a report of poisoning from the decocted herb, and it should not be read as one. A 2021 review of the plant covers its toxicological findings alongside its pharmacology.

  Source: materia medica consensus, cross-referenced against multiple online sources; cytotoxic triterpenoid saponins per PMID 18253886, DOI 10.1080/10286020701394381; toxicological review per PMID 33996757, PMC 8117358, DOI 10.3389/fchem.2021.666280. Reference note, not a safety guarantee.

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented for Wang Bu Liu Xing. No human interaction study, and no CYP or transporter data, was located. On general pharmacological grounds a practitioner would want to know about it alongside anticoagulant or antiplatelet medication, since the herb’s whole purpose is to move blood and its recorded cautions already exclude patients who are bleeding — but this is a precaution drawn from the herb’s traditional action, not from a documented interaction. Its use with medications that affect prolactin or lactation is likewise unstudied. (Flagged for practitioner confirmation.)

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 Wang Bu Liu Xing (Vaccaria segetalis)?

  Yes — and unusually, the research clusters around exactly the traditional use it is best known for. The seed’s flavonoid glycoside vaccarin has repeatedly been shown to increase milk production in animal models, which is a genuinely close match to the classical indication. There are still no adequate human trials.

  • Lactation (animal, mechanistic) — a 2025 study in rats with induced lactation insufficiency reported that vaccarin increased milk production, improved mammary duct and follicle structure, and raised prolactin and prolactin-receptor expression, acting through an ALKBH5–SFRP2–Wnt/β-catenin pathway. Earlier animal work had already described prolactin-like activity and an increase in prolactin receptors on mammary epithelial cells, and the seeds are also reported to have mild oestrogen-like activity.
  • Human evidence for lactation — the NIH lactation database states that no well-performed clinical trial of the orally taken seeds as a galactogogue has been reported in English. A separate systematic review of auricular therapy for lactation — the technique in which vaccaria seeds are taped to ear points — found the published trials generally positive but methodologically weak. The traditional use is therefore supported by mechanism and long practice, not by trial evidence.
  • Urinary tract — polysaccharides extracted from vaccaria seed reduced urinary tract infection in animal models by interfering with the adhesion and invasion of uropathogenic E. coli, and a related study reported regulation of cathelicidin expression in kidney infection. Preclinical.
  • Chemistry and processing — a 2021 review summarises the plant’s ethnomedicinal record, constituents (including vaccarin, quercetin derivatives and triterpenoid saponins), pharmacology and toxicology; a 2024 study identified quality markers distinguishing raw from wine-steamed material for the blood-invigorating action.
  • Cardiovascular (compound-level) — vaccarin as an isolated compound has a sizeable literature of its own in vascular endothelial cell models. This is compound pharmacology and does not translate directly to the decocted herb.

  No human clinical trials of the herb for its traditional indications met a standard worth citing as evidence. This is supportive context, not proof of clinical efficacy.

  Sources: PMID 40311715, DOI 10.1016/j.jep.2025.119898 (vaccarin and lactation insufficiency, rats); NIH Drugs and Lactation Database (LactMed) record for Vaccaria, PMID 37094052; PMID 29122257, DOI 10.1016/j.ctcp.2017.09.006 (auricular therapy for lactation, systematic review); PMID 36506014, PMC 9727262, DOI 10.3389/fcimb.2022.1004751 (seed polysaccharides and urinary tract infection); PMID 33141055, DOI 10.1016/j.jep.2020.113505 (seed polysaccharides and kidney infection); PMID 33996757, PMC 8117358, DOI 10.3389/fchem.2021.666280 (review); PMID 37666377, DOI 10.1016/j.jep.2023.117120 (raw versus wine-steamed quality markers); PMID 31105824, PMC 6511755 (vaccarin, endothelial cell model). Research context, not a therapeutic claim.

Chinese Herb Notes

• Why is Wang Bu Liu Xing used both to promote milk and to treat breast lumps?

  Because in Chinese medicine both problems are read the same way: something in the breast is not moving. The herb is not doing two opposite things. It has one action — unblocking the channels and collaterals of the breast — and that single action produces milk where milk was stuck and disperses accumulation where accumulation had formed. Which result you get depends on what was obstructed, not on the herb changing behaviour.

  • Insufficient lactation — understood as the milk being present but not flowing, typically from Liver-Qi constraint or blood stasis blocking the breast collaterals. Opening those collaterals lets the milk down. This is the reading behind the herb’s reputation as a galactogogue.
  • Breast lumps, distension and abscess — the same obstruction, further along: stagnant Qi and blood congealing into a palpable mass, or heat entering it to form an abscess. The moving action disperses the accumulation and, with the herb’s recorded abscess-draining function, helps discharge pus.
  • The same logic outside the breast — the recorded indications for amenorrhoea, painful periods and painful obstruction are the same action applied to different passages. Blocked menses and blocked milk are, in this framework, the same problem in a different place.

  What is Wang Bu Liu Xing combined with?

  • Lu Lu Tong (sweetgum fruit, held here as Fructus Liquidambaris Taiwaniae, bitter and neutral, Liver and Stomach channels) — the same flavour, the same nature and the same two channels as Wang Bu Liu Xing. The two are a long-standing pair for lactation and for breast distension, and the pairing is well enough established to be recorded in the NIH lactation literature as a named herb pair.
  • Chuan Shan Jia (pangolin scales) — the classical partner for opening the breast collaterals and promoting milk, the two herbs traditionally described as working through and downward together. It should be said plainly that pangolins are critically endangered and internationally protected, that pangolin scale is no longer an acceptable material, and that this pairing is recorded here as history. Substitutes are used in modern practice.
  • Blood-moving formulas generally — no formula record on this site currently lists Wang Bu Liu Xing among its ingredients. It belongs more to the tradition of modifications added to gynaecological and breast formulas than to the named classical prescriptions.

  Botanical naming: the Latin recorded here is Semen Vaccariae Segetalis. The currently accepted botanical name for the plant is Vaccaria hispanica (Mill.) Rauschert; Vaccaria segetalis and Gypsophila vaccaria are synonyms for the same species, and all three appear in the literature. This is a naming history rather than a conflict — the plant is a member of the carnation family (Caryophyllaceae), not a legume, despite the seed’s appearance.

  Source: Sacred Lotus sources & references (recorded actions and cautions; Lu Lu Tong and Chuan Shan Jia herb records; formula-ingredient records checked and none found containing this herb); cross-referenced against multiple online sources and materia medica consensus; the Wang Bu Liu Xing / Lu Lu Tong galactogogue pair and the botanical synonymy per the NIH Drugs and Lactation Database (LactMed) record for Vaccaria, PMID 37094052, and PMID 33996757, PMC 8117358.