Yuan Ming Fen

Chinese Herb Actions

Chinese Herb Dosage

• What is the dosage of Yuan Ming Fen?

  Our record gives no separate dose for Yuan Ming Fen and refers the reader to Mang Xiao, the crystalline grade. Published sources place the refined powder at a smaller internal dose than the crystal, consistent with our record's statement that it is the weaker purgative of the two, but our own entry does not carry a figure for it and we are not going to supply one that is not held.

  • What the crystalline grade is recorded at — roughly 3–9 g, and up to 9–12 g within a formula, dissolved into the strained decoction after it comes off the heat rather than boiled with the other herbs. That figure belongs to Mang Xiao and is given here for scale, not as a dose for this grade.
  • Topical use — as a dry powder or dissolved rinse for throat, mouth and eye applications, in quantities unrelated to any internal dose. This is the use our record emphasises.
  • Not interchangeable by weight — the grades of this mineral differ in water content as well as in purity, so a gram of the dried powder is not chemically equivalent to a gram of the hydrated crystal. That is a real reason the figures are recorded separately rather than a formality.

  Source: Sacred Lotus sources & references (this herb's recorded deferral to Mang Xiao and its topical emphasis, and the recorded dose range and dissolve-don't-decoct rule held on the Mang Xiao entry); hydration difference between grades per PMID 38239194, PMC 10794775. Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Yuan Ming Fen?

  Yes — being the gentlest grade of the family does not take it out of the family. This is still a cold, downward-draining mineral salt, and the cautions recorded across the mirabilite group apply, with pregnancy the most important of them.

  • Pregnancy — our own Mang Xiao entry records the mirabilite group as contraindicated throughout pregnancy, and as avoided during menstruation and postpartum without qualified supervision. The Pharmacopoeia of the People's Republic of China states for this mineral that pregnant women should be cautious about using it, and that it should not be used with sulphur or with Bolboschoenus yagara (reported in PMID 38239194).
  • Recorded incompatibility in the group — our own herb-pairing data holds sulphur (Liu Huang) as antagonising the crude grade of this mineral. The pairing is a classical restriction on the substance rather than on one grade of it, and is recorded here for completeness.
  • Deficiency-cold digestive patterns — avoid. Cold, draining materials aggravate Spleen and Stomach deficiency-cold, and a weaker purgative is still a purgative.
  • Weakness, age, or absence of true excess heat — the group's purgative action is intended for excess, heat-type patterns, not for general use.
  • Topical does not mean casual — the throat, mouth and eye applications our record emphasises put a concentrated salt onto mucous membranes. Documented external effects for this mineral include local skin flushing and itching (PMID 38239194). Professional supervision applies.

  Source: Sacred Lotus sources & references (this herb's recorded topical emphasis and relative weakness, the recorded pregnancy and deficiency-cold cautions held on the Mang Xiao entry, and the recorded sulphur antagonism held on the Po Xiao entry); Pharmacopoeia restriction and external-effect data as reported in PMID 38239194, PMC 10794775. Neutral reference disclosures, not usage instructions.

Chinese Herb Toxicity & Overdose

• Is Yuan Ming Fen toxic? How pure is the refined powder?

  Our record does not flag Yuan Ming Fen as toxic, and the 2024 review of this mineral states that its chemical composition is not itself toxic — while also stating that only a few toxicological studies of the material exist at all. That is the honest scale of what is documented, and it is better said precisely than papered over with general claims about mineral medicines.

  • What is documented for this material. The review reports that external application can leave local skin flushed or itchy; that oral administration has been shown toxic to neuromuscular cells, with a 30% sodium sulfate solution causing calcium efflux and potassium influx in the cited experimental work; and that sulfur ions arising from metabolism of the sulfate can be absorbed by digestive-tract epithelium and disturb oxidative metabolism. No pharmacokinetic study of this mineral as a single agent has been carried out (PMID 38239194).
  • On purity — what has actually been measured. A market survey reported within that review, covering mirabilite bought across China and analysed by X-ray diffraction, X-ray fluorescence and heating analysis, found sodium sulfate at 88–96% of the material, with traces of potassium, calcium, iron, copper, zinc, bromine and strontium, and magnesium very low at 300–700 parts per million. That is a measurement on the mineral group, not on this refined grade specifically.
  • What we are not saying. No market survey or elemental assay specific to Yuan Ming Fen was located, so none is cited, and we assert neither that it is contaminated nor that it is clean. Refining is what the extra processing step is for; that is a statement about intent, not a measurement of any batch.
  • The class-level context. A 2022 review of mineral drugs in Chinese medicine states that the safety of the class “is controversial owing to their heavy metals and strong toxicity” (PMID 35144660, PMC 8830990) — a description of the debate around mineral medicinals as a category, and a legitimate reason to ask the question, not a finding about this material.

  Source: Sacred Lotus sources & references (the absence of a toxicity flag on this record, as held on file); material-specific toxicology and the market purity survey per PMID 38239194, PMC 10794775, DOI 10.3389/fphar.2023.1293097; class-level context per PMID 35144660, PMC 8830990. Neutral reference facts — not a safety guarantee.

Herb-Drug Interactions

• Does Yuan Ming Fen interact with medications?

  No clinical herb–drug interaction study for this material could be located, and the 2024 review notes that no pharmacokinetic study of it as a single agent has been performed (PMID 38239194). What can reasonably be flagged is mechanistic rather than measured: this is a sodium salt with osmotic purgative activity, so practitioner awareness is sensible for anyone taking diuretics or other medicines affecting fluid and electrolyte balance, anyone on a sodium-restricted regimen, and anyone with renal impairment.

  • This is inference from composition and mechanism, not a demonstrated interaction. No study of this mineral co-administered with any drug was found.
  • Route matters to the question — the throat, mouth and eye applications our record emphasises involve far less systemic exposure than an internal purgative dose, which is worth stating rather than leaving to inference.

  (Precautionary, based on constituent class; 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 Yuan Ming Fen (exsiccated sodium sulfate, weathered mirabilite)?

  There is a real research literature on mirabilite, and the weathered powder does appear in it by name — but almost always alongside the other grades rather than on its own. The anchor source is a 2024 review in Frontiers in Pharmacology that assembles the mineral's history, processing methods, chemistry, pharmacology, toxicology and clinical use in one place (PMID 38239194; PMC 10794775; DOI 10.3389/fphar.2023.1293097).

  • Where this grade was actually tested — the review tabulates mouse small-intestine propulsion experiments in which the weathered powder, the refined crystal and the crude grade were compared side by side, reporting that all three increased intestinal movement relative to saline. These are small animal studies from the Chinese-language literature, summarised within the review rather than independently verifiable here, and they are reported as such. They are also the closest thing to a direct grade-versus-grade comparison that exists.
  • What the mineral does pharmacologically — the review summarises anti-inflammatory effects (reduced IL-6, TNF-α and nitric oxide levels), promotion of cell proliferation and wound healing via TGF-β1 and VEGF-A, and increased gastrointestinal motility mediated by vasoactive intestinal peptide, substance P and motilin. It also records the mineral's use across nine Chinese ethnic-medicine traditions over more than two thousand years, and its Pharmacopoeia indications including abdominal distension, abdominal pain, constipation and external application for swellings and haemorrhoids.
  • Cholesterol handling — a 2024 mouse study found sodium sulfate reduced hypercholesterolaemia by upregulating hepatic Cyp7a1 and eased hepatic insulin resistance by downregulating Trib3 (PMID 39071912; PMC 11273247; DOI 10.3892/etm.2024.12650). Preclinical mechanism, not a treatment claim.

  Honest summary: the modern evidence treats this mineral as a family and supports its external anti-inflammatory and motility-promoting uses more directly than any grade-specific claim. Nothing located tests the throat, mouth or eye applications that our record emphasises for this particular grade, and we are not going to imply otherwise.

  Sources: PMID 38239194, PMC 10794775, DOI 10.3389/fphar.2023.1293097 (mirabilite chemistry, processing, pharmacology, toxicology and clinical review, and the source of the grade-comparison summaries); PMID 39071912, PMC 11273247, DOI 10.3892/etm.2024.12650 (sodium sulfate, cholesterol and hepatic insulin resistance in mice); PMID 35144660, PMC 8830990 (mineral drugs in Chinese medicine, class-level review). Research context, not a therapeutic claim.

Chinese Herb Notes

• What is the difference between Yuan Ming Fen, Mang Xiao and Po Xiao?

  They are one mineral at three stages of refining, not three substances. All three are sodium sulfate, and every one of them is held on this site as its own entry. Yuan Ming Fen sits at the far, most-processed end of that sequence. Set out in order:

  • Po Xiao — crude. The mined mineral or its first coarse crystallisation. Our record holds it as Sal Glauberis and confines it to external use for swellings and nodules because of impurities. The modern equivalent step is dissolving natural mirabilite in hot water, filtering, and cooling so crystals precipitate; the coarse product of that step is known as Pixiao (PMID 38239194).
  • Mang Xiao — purified crystal. Our record holds it as Natrii Sulfas, salty, bitter and very cold, Stomach and Large Intestine. Since the Ming dynasty the mainstream refining method has been boiling the crude crystals with radish and cooling the liquid to yield the purified crystal (PMID 38239194). This is the purgative grade of the classical formulas.
  • Yuan Ming Fen — weathered powder (this page). Mirabilite left to weather loses its water of crystallisation and becomes a dry white powder. The 2024 review names that product Xuanming powder and records that Ben Cao Meng Quan (AD 1565) distinguished processing with and without an excipient, naming the excipient-free product Yuanming powder (PMID 38239194). Our record's description — most refined, mainly topical, weaker at heat-clearing and purging — matches that material precisely.

  The short version: purgative strength falls as refinement rises, and suitability for throat, mouth and eye application rises with it. Yuan Ming Fen is the gentle end of the family.

  Is Yuan Ming Fen the same thing as Xuan Ming Fen?

  Yes — they are two names for the same material, and readers meeting both should not treat them as separate herbs. The 2024 review uses the Xuanming form for the weathered powder while recording Yuanming powder as the historical name entered in Ben Cao Meng Quan (PMID 38239194). Our site holds the material under Yuan Ming Fen; no separate Xuan Ming Fen record exists here, and none is needed.

  Identity problem flagged, not corrected: our Latin field for this herb reads Matrii Sulfas Exsiccatus. The pharmacopoeial heading for exsiccated sodium sulfate is Natrii Sulfas Exsiccatus, and our own Mang Xiao record correctly holds Natrii Sulfas for the hydrated crystal — so the initial letter here appears to be an error rather than a variant reading, and there is no mineral named “matrium.” The record also carries no Chinese characters, no common English name and no alternative names, despite Xuan Ming Fen being in circulation as a name for the same material. We have left every field exactly as held; correcting them is an owner decision.

  Formula context: our own formula records link no formula to this grade — the purgative formulas in our collection specify the crystalline material — so no formula is named here.

  Source: Sacred Lotus sources & references (the Yuan Ming Fen, Mang Xiao and Po Xiao records — Latin, nature, flavour, channels, category and recorded notes — as held on file, and the absence of any formula link or separate Xuan Ming Fen record); refining sequence and historical naming per PMID 38239194, PMC 10794775. Reference facts, not preparation instructions.