Sheng Tie Luo (Iron Filings)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Sheng Tie Luo, and how is it prepared?

  30–60 g in decoction is the standard range across materia medica references — roughly 30 g for milder presentations (insomnia, irritability, palpitations from fright) and up to 45–60 g for more severe agitation. Because it is a heavy, slow-releasing mineral, it must be decocted first (先煎, xiàn jiàn) for an extended period before the other herbs are added — classical sources describe decocting it for up to about three hours, while modern practice calls for a minimum of 30–45 minutes. When ground to powder for pills, the dose is far smaller, about 3–9 g.

  Source: Chinese materia medica dosage ranges (煎服 30–60g); multiple online sources (decoct-first practice, powder dosing). Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Sheng Tie Luo?

  Sheng Tie Luo is contraindicated in Spleen/Stomach deficiency with cold — its cooling, heavy, mineral nature can further impair digestion and worsen loose stools, poor appetite, and cold in the middle. It is also cautioned against in Liver blood or Liver yin deficiency patterns, where its cooling, descending action could deplete rather than nourish an already-deficient Liver.

  • Middle Jiao (Spleen/Stomach) deficiency-cold — avoid or use only with caution; can worsen digestive symptoms.
  • Liver blood/yin deficiency — the heavy, cooling, descending action can aggravate rather than relieve the underlying deficiency.
  • Short-term use principle — as a heavy mineral sedative, it is traditionally reserved for acute agitation/mania rather than sustained daily tonification, and used under practitioner supervision rather than as self-directed long-term treatment.

  Source: multiple online sources, summarized. Reference note, not a safety guarantee.

Chinese Herb Toxicity & Overdose

• Comparatively low among TCM mineral substances at normal, short-term therapeutic doses. Sheng Tie Luo is essentially metallic iron/iron-oxide scale — chemically far removed from the genuinely toxic minerals used in Chinese medicine, such as Zhu Sha (mercuric sulfide) or Xiong Huang (arsenic sulfide). No dedicated modern toxicology studies specific to Sheng Tie Luo were located. The reasonable general concerns raised for orally ingested iron-containing minerals are gastric irritation with prolonged/high dosing and, theoretically, iron accumulation with sustained heavy use — consistent with the traditional short-term-use guidance above.

  Source: mineralogical identity (metallic iron/iron oxide); general materia medica caution for heavy mineral substances. Dedicated toxicology data flagged as absent, not as reassurance.

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented for Sheng Tie Luo specifically. Given its iron content, practitioner awareness is a reasonable precaution for patients concurrently taking oral iron supplements or medications sensitive to iron chelation (e.g., certain tetracycline-class antibiotics, levothyroxine) — this is extrapolated from general iron-mineral pharmacology, not a demonstrated interaction for this substance. (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 Sheng Tie Luo (Frusta Ferri)?

  No — and this should be stated plainly. PubMed/PMC searches did not locate any dedicated modern clinical or pharmacological study of Sheng Tie Luo/Frusta Ferri itself; direct research evidence is essentially absent rather than merely limited.

  What exists is class-level context for related iron-oxide minerals used the same way in Chinese medicine:

  • Mineral-medicine review (2022) — an open-access review of mineral drugs in Chinese medicine profiles magnetite (Ci Shi), used for “tranquillization…suppressing hyperactive liver,” and ochre/hematite (Dai Zhe Shi), used for “suppressing hyperactive liver” and descending rebellious qi — the same functional class as Sheng Tie Luo — and discusses processing (calcination, vinegar-quenching) as a general strategy for reducing the toxicity of mineral drugs. It does not address Sheng Tie Luo specifically.

  Treat this as background on the mineral-drug class, not evidence for Sheng Tie Luo itself.

  Source: PMID 35144660, PMC 8830990, DOI 10.1186/s13020-022-00577-9 (mineral medicine review, general class context only). Absence of dedicated research on this herb stated explicitly; research context, not a therapeutic claim.

Chinese Herb Notes

• How does Sheng Tie Luo differ from other heavy, spirit-calming minerals, and what is its key formula?

  Sheng Tie Luo is the heavy mineral most specifically tied to manic agitation and phlegm-fire, distinguished by its acrid-cool, Heart-Liver profile and its signature formula, Sheng Tie Luo Yin.

  How it compares with its neighbors:

  • vs Ci Shi (Magnetite) — Ci Shi is salty and cold, enters Kidney, Liver, and Lung, and pairs spirit-anchoring with Kidney tonification (hearing, vision, grasping qi for wheezing). Sheng Tie Luo is acrid and cool, enters only Heart and Liver, and is used more specifically for manic agitation (dian kuang) than for Kidney-deficiency patterns.
  • vs Long Gu / Mu Li — fossilized mammal bone and oyster shell also settle floating yang and are often the first choice for spontaneous sweating, seminal emission, and general anxiety. Sheng Tie Luo's niche sits at the more acute, agitated end of the spectrum — mania and violent agitation.
  • vs Zhu Sha (Cinnabar) — both settle severe agitation and insomnia, and are combined directly in some formulas (Sheng Tie Luo with Zhu Sha and Chuan Bei Mu, for manic behavior from phlegm-fire). Zhu Sha is mercuric sulfide and carries mercury toxicity that Sheng Tie Luo does not.

  Key formula: Sheng Tie Luo Yin (Iron Filings Decoction), from Yi Xue Xin Wu (Medical Revelations, Cheng Guopeng, Qing dynasty) — treats phlegm-fire disturbing the Heart (the manic/kuang phase of mania-withdrawal), with a scarlet tongue, yellow greasy coating, and a wiry rapid pulse. It combines Sheng Tie Luo with phlegm-resolving, yin-nourishing, and spirit-calming herbs including Dan Nan Xing, Chuan Bei Mu, Xuan Shen, Tian Men Dong, Mai Men Dong, Lian Qiao, Gou Teng, Dan Shen, Fu Ling, Fu Shen, Shi Chang Pu, Yuan Zhi, and Zhu Sha. Sheng Tie Luo is also recorded simply combined with Gan Cao (licorice) for mania following intense anger. (Traditional formula context, not treatment advice.)

  Source: Sacred Lotus's own Sheng Tie Luo Yin formula record; Bensky-aligned English materia medica (multiple online sources).