Ingredient Mineral (矿物 kuàng wù)

Sheng Tie Luo

Iron filings · 生铁落

Fe₃O₄ (Ferrosoferric oxide, from Magnetite ore) · Frusta Ferri

Also known as: Tie Xie (铁屑)

Sheng Tie Luo (Iron filings) plant

Images shown are for educational purposes only

Sheng Tie Luo is a mineral substance made from iron scale flakes that fall off red-hot iron during blacksmithing. It has a heavy, grounding quality that calms the mind and settles emotional agitation, and is primarily used for severe restlessness, mania, fright, and insomnia caused by excess heat rising in the body. Because traditional ironworking has declined, this substance has become increasingly difficult to source in modern practice.

Category Liver Yang-subduing herbs (平抑肝阳药) Substances that anchor and calm the Spirit (重镇安神药)
Therapeutic focus Emotional Wellbeing Sleep Support Neurological Health Stress and Anxiety

TCM Properties

Temperature

Cool

Taste

Acrid / Pungent (辛 xīn)

Channels entered

Heart, Liver

Parts used

Mineral (矿物 kuàng wù)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Ingredient Does

Every ingredient has a specific set of actions — here's what Sheng Tie Luo does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Sheng Tie Luo is primarily used to support these areas of health:

Emotional Wellbeing Sleep Support Neurological Health Stress and Anxiety

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Sheng Tie Luo performs to restore balance in the body:

Calms the Liver and Subdues Yang Calms the Spirit and Settles Fright Clears Heat from the Liver and Heart Resolves Toxicity and Heals Sores

How these actions work

'Calms the Liver and subdues Yang' (平肝镇惊) is the primary action of Shēng Tiě Luò. As a heavy mineral substance derived from iron, it has a strongly descending nature. In Five Phase theory, metal controls wood, so iron's metallic quality directly restrains the Liver (which belongs to Wood). When Liver Fire or Liver Yang flares upward, causing violent agitation, rage, or mania, this herb's heavy, sinking quality rapidly pulls the rising force back down. This is why it has been used since antiquity for conditions involving uncontrolled anger and manic behaviour.

'Settles fright and calms the spirit' means it steadies an agitated mind. Because it enters both the Heart and Liver channels and has a weighty, grounding nature, it anchors the spirit (Shén) when it is unsettled by fright, emotional shock, or internal fire. It is used for palpitations, easily being startled, severe anxiety, and insomnia caused by excess heat disturbing the Heart.

'Clears Heat from the Liver and Heart' refers to its cool nature and pungent taste working together to disperse and drain fire from these two organ systems. This makes it useful when Liver or Heart fire produces symptoms like a red face, red eyes, restlessness, or delirium.

'Resolves toxicity and heals sores' is a secondary external-use action. Ground into powder and mixed with lard or oil, it can be applied topically to skin sores, boils, and childhood skin rashes caused by heat toxins.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Sheng Tie Luo is used to help correct these specific patterns.

Why Sheng Tie Luo addresses this pattern

When Liver Fire flares intensely, it causes violent anger, agitation, and manic behaviour. Shēng Tiě Luò is cool in nature and enters the Liver channel, directly clearing Liver Fire. Its heavy, metallic quality uses the Five Phase principle of metal controlling wood to forcefully subdue the Liver's rebellious upward surge. Classical texts describe this mechanism as 'taking metal's Qi to restrain it' (取金气以制之). This makes it especially suited for acute flare-ups of Liver Fire with rage and loss of emotional control.

A practitioner would look for one or more of these signs

Irritability

Intense anger and violent outbursts

Mania

Manic behaviour with agitation

Insomnia

Inability to sleep due to restless agitation

Red Eyes

Red face and red eyes from rising fire

Commonly Used For

These are conditions where Sheng Tie Luo is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Liver Fire Blazing Phlegm-Fire harassing the Heart

TCM Interpretation

In TCM, what modern medicine calls mania (or the manic phase of bipolar disorder) overlaps with the classical disease category of 'kuáng' (狂). This is understood as a condition where prolonged emotional stagnation, often from frustration, anger, or shock, transforms into internal Fire. This Fire blazes upward, disturbing the Heart (where the spirit resides) and causing the Liver to lose its smooth flow. When Phlegm also accumulates and combines with Fire, the resulting Phlegm-Fire obstructs the Heart's orifices, producing the chaotic, out-of-control behaviour characteristic of mania: screaming, violent outbursts, irrational speech, and inability to rest or sleep.

Why Sheng Tie Luo Helps

Shēng Tiě Luò directly addresses the core mechanism of mania through its cool, heavy, metallic nature. Its heaviness rapidly pulls the wildly rising Liver Fire and Qi back downward, like an anchor steadying a storm-tossed ship. Its cool temperature clears the excess Heat fuelling the manic state, while its entry into both Heart and Liver channels means it can calm the spirit and restrain the Liver simultaneously. The Su Wen itself records Shēng Tiě Luò as a treatment for manic rage, noting its ability to 'bring down Qi rapidly.' In the well-known formula Shēng Tiě Luò Yǐn, it serves as the primary herb, decocted first for an extended period to extract its mineral properties before the other herbs are added.

Also commonly used for

Anxiety

Severe anxiety with restlessness and being easily startled

Epilepsy

Epileptic seizures, historically described as 'fright epilepsy' (惊痫)

Severe Heart Palpitations

Palpitations with anxiety and a feeling of fright

Delirium

Delirium during febrile illness or acute mental disturbance

Neurasthenia

Severe neurasthenia with insomnia and emotional instability

Bipolar Disorder

Manic phase of bipolar disorder with agitation and irritability

Ingredient Properties

Every ingredient has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Cool

Taste

Acrid / Pungent (辛 xīn)

Channels Entered

Heart Liver

Parts Used

Mineral (矿物 kuàng wù)

Dosage & Preparation

These are general dosage guidelines for Sheng Tie Luo — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

30-60g

Maximum dosage

Up to 60g in decoction for acute mania or severe agitation, under practitioner supervision. Must be decocted first for an extended time (30-45 minutes minimum) before adding other herbs.

Dosage notes

The standard dose of 30-60g reflects this substance's mineral nature and low bioavailability. A smaller dose (30g) may suffice for milder conditions such as insomnia with irritability or palpitations from fright. The higher dose range (45-60g) is used for more severe presentations such as acute mania or violent agitation. When used in powdered form for pills or powders, the dose is substantially lower (3-9g). For external application (e.g. treating sores or sprains), the amount is adjusted as needed. Because Sheng Tie Luo has a heavy, settling quality, it tends to impair digestion if used for extended periods. Short courses of treatment are preferred.

Preparation

Sheng Tie Luo must be decocted first (先煎, xian jian) for an extended period before adding other herbs. Classically, the Su Wen formula and later the Yi Xue Xin Wu specify decocting Sheng Tie Luo for up to 3 hours (三炷香); modern practice recommends a minimum of 30-45 minutes of prior decoction. The resulting decoction water is then used as the base liquid for cooking the remaining herbs. An alternative classical processing method involves calcining the iron filings until red-hot and quenching them in rice vinegar, repeated seven times (醋淬). This vinegar-quenched form produces ferrous acetate, which is more readily absorbed. For external use, it is ground into a fine powder and mixed with lard (猪脂) or vinegar for topical application.

Processing Methods

In TCM, the same ingredient can be prepared in different ways to change its effects — here's how processing alters what Sheng Tie Luo does

Processing method

The raw iron flakes are placed in a fire-resistant container and heated with strong fire until glowing red-hot, then immediately quenched in rice vinegar. For every 100 kg of iron flakes, approximately 25 kg of rice vinegar is used. The process may be repeated for thorough processing.

How it changes properties

Quenching in vinegar converts some of the iron oxide into iron acetate, which is more easily absorbed by the body. This enhances the herb's ability to supplement Blood (a secondary action) and increases the sedative effect. The vinegar processing also makes the material more friable and easier to decoct. The overall thermal nature remains cool, but the astringent and Blood-nourishing properties are strengthened.

When to use this form

When the practitioner wants enhanced sedative and Blood-supplementing effects, or when the raw material needs to be made more soluble for decoction. Also preferred for external application where easier grinding is needed.

Common Ingredient Pairs

These ingredients are traditionally combined with Sheng Tie Luo for enhanced therapeutic effect

Gou Teng
Gou Teng Shēng Tiě Luò 30g : Gōu Téng 9-15g

Shēng Tiě Luò's heavy mineral nature subdues Liver Fire by anchoring it downward, while Gōu Téng clears Liver Heat and calms Liver Wind from the channel level. Together they provide a two-pronged approach: Shēng Tiě Luò controls the root uprising of fire and Yang, while Gōu Téng smooths the Liver's function and prevents Wind from stirring.

When to use: Liver Fire or Liver Yang rising with agitation, dizziness, irritability, or tendency toward seizures and tremors.

Tian Nan Xing
Tian Nan Xing Shēng Tiě Luò 30g : Dǎn Nán Xīng 3-6g

Shēng Tiě Luò anchors the spirit and subdues Liver Fire, while Dǎn Nán Xīng clears Heat-Phlegm that is blocking the Heart's orifices. Together they address both the Fire and the Phlegm in Phlegm-Fire mania, tackling the two pathogenic factors that drive acute mental disturbance.

When to use: Phlegm-Fire harassing the Heart with mania, delirium, incoherent speech, or epilepsy.

Shi Chang Pu
Shi Chang Pu Shēng Tiě Luò 30g : Shí Chāng Pú 3-6g

Shēng Tiě Luò heavily sedates and anchors the disturbed spirit from above, while Shí Chāng Pú opens the Heart's orifices and dispels Phlegm misting the mind. The combination works by both clearing the obstruction (Shí Chāng Pú opening what is blocked) and stabilising what has been disturbed (Shēng Tiě Luò grounding the spirit).

When to use: Phlegm obstructing the Heart orifices with mental confusion, seizures, or mania alongside spirit disturbance.

Gan Cao
Gan Cao Shēng Tiě Luò 9-15g : Gān Cǎo 3g

A simple classical pairing: Shēng Tiě Luò calms the Liver and subdues the violent uprising of Fire, while Gān Cǎo harmonises and moderates, protecting the Stomach from the heavy mineral and easing the acuteness of the emotional disturbance.

When to use: Acute outbursts of rage and manic behaviour when a simple, fast-acting combination is needed. Recorded in the Fāng Mài Zhèng Zōng for sudden violent anger.

Key Formulas

These well-known formulas feature Sheng Tie Luo in a prominent role

Sheng Tie Luo Yin 生铁落饮 King

This is the namesake formula and the definitive showcase of Shēng Tiě Luò's properties. Developed by the Qing dynasty physician Chéng Guópéng in the Yī Xué Xīn Wù (1732) for Phlegm-Fire mania, Shēng Tiě Luò serves as the primary herb (decocted first for an extended period) to anchor the wildly disturbed spirit and subdue Liver Fire, while the remaining herbs clear Phlegm, open the orifices, and nourish depleted Yin. This formula demonstrates the full scope of the herb's spirit-calming and Liver-subduing actions in acute psychiatric conditions.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Dai Zhe Shi
Sheng Tie Luo vs Dai Zhe Shi

Both are heavy mineral substances that subdue Liver Yang. However, Dài Zhě Shí (Hematite) is bitter, cold, and enters the Liver, Heart, and Stomach channels. Its primary strength is descending rebellious Qi, especially Stomach Qi (for belching, hiccups, nausea, vomiting), and it also cools Blood to stop bleeding. Shēng Tiě Luò is pungent and cool, focused almost exclusively on calming the spirit and settling acute mental agitation (mania, fright, rage). Choose Dài Zhě Shí when the main problem is rebellious ascending Qi in the Stomach or bleeding; choose Shēng Tiě Luò when the main problem is acute psychiatric disturbance with Liver Fire.

Ci Shi
Sheng Tie Luo vs Ci Shi

Both are iron-based minerals that calm the spirit and subdue Liver Yang. Cí Shí (Magnetite) is salty, cold, and enters the Heart, Liver, and Kidney channels. Its key advantage is that it also nourishes the Kidneys, helping with hearing loss, blurred vision, and anchoring Qi back into the Kidneys for conditions like asthma. Shēng Tiě Luò does not have these Kidney-nourishing or Qi-anchoring actions. Instead, it is more specifically and powerfully targeted at acute Liver Fire flare-ups causing mania and violent emotional disturbance. Choose Cí Shí for chronic Kidney deficiency patterns with dizziness, tinnitus, or asthma; choose Shēng Tiě Luò for acute psychiatric emergencies driven by Liver Fire.

Long Gu
Sheng Tie Luo vs Long Gu

Both are heavy substances that calm the spirit and subdue Yang. Lóng Gǔ (Dragon Bone) is sweet, astringent, and neutral, entering the Heart, Liver, and Kidney channels. Its distinguishing feature is its strong astringent action, which is useful for conditions involving leakage (spontaneous sweating, nocturnal emissions, chronic diarrhoea, uterine bleeding). Shēng Tiě Luò has no astringent property and instead specifically clears Liver and Heart Heat. Choose Lóng Gǔ when spirit disturbance is accompanied by leakage or deficiency patterns; choose Shēng Tiě Luò for excess-type mania with prominent Heat and anger.

Identity & Adulterants

Related species and common adulterations to be aware of when sourcing Sheng Tie Luo

Sheng Tie Luo (生铁落, oxidized iron flakes from forging) should not be confused with several related but distinct iron-derived medicinal substances: - Ci Shi (磁石, Magnetitum): a naturally occurring magnetite ore. Although chemically similar (Fe3O4), it is a different medicinal substance with different clinical applications (anchors and calms the Liver, benefits hearing and vision, aids Kidney Qi grasping). - Dai Zhe Shi (代赭石, Haematitum): a red iron ore (Fe2O3), which also descends Qi but is particularly used for rebellious Stomach Qi, and has different properties. - Zhen Xiu Sha (针砂): iron filings from grinding or filing iron. Sometimes confused with Sheng Tie Luo but traditionally considered a different substance. With the decline of traditional blacksmithing, authentic Sheng Tie Luo (specifically the oxidized scale hammered from red-hot iron) has become difficult to obtain. Modern substitutions may use industrially produced iron oxide powder or generic iron filings, which may differ in composition and therapeutic effect from the traditionally produced material.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any ingredient.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Sheng Tie Luo

Non-toxic

Sheng Tie Luo is generally classified as non-toxic at standard dosages. Its main component is magnetite (Fe3O4), an iron oxide that is poorly absorbed from the gastrointestinal tract, which limits systemic iron exposure. However, when processed by calcining and quenching in vinegar (醋淬), some iron converts to ferrous acetate, which is more readily absorbed. Excessive or prolonged use could theoretically contribute to iron accumulation, particularly in individuals with impaired iron metabolism. The Ben Cao Feng Yuan notes it should be calcined red-hot and quenched in vinegar seven times before use (铁铫内煅赤，醋沃七次用). At standard therapeutic doses used for short periods, it is considered safe. Gastrointestinal discomfort (nausea, constipation) may occur in sensitive individuals due to the mineral nature of the substance.

Contraindications

Situations where Sheng Tie Luo should not be used or requires extra caution

Caution

Liver deficiency (Liver Blood or Liver Yin deficiency) patterns. Sheng Tie Luo's heavy, descending, and cooling nature can further weaken an already deficient Liver, worsening symptoms rather than helping them.

Caution

Middle Jiao (Spleen/Stomach) deficiency with cold. The cool nature and heavy mineral quality of this substance can impair digestive function and worsen symptoms of cold-type Spleen deficiency such as loose stools, poor appetite, and abdominal cold.

Avoid

Patients with iron overload conditions (hemochromatosis or hemosiderosis). Prolonged internal use of iron-based minerals may contribute to excessive iron accumulation in the body.

Caution

Long-term continuous use without practitioner supervision. As a heavy mineral sedating substance, it is intended for short-term use to control acute symptoms, not as a long-term tonic.

Caution

Patients with peptic ulcers or active gastrointestinal bleeding. Iron filings can irritate the gastric mucosa and may worsen existing ulceration.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Use with caution during pregnancy. While there are no specific classical prohibitions, the heavy descending nature of mineral substances and the cooling property of Sheng Tie Luo warrant caution. Its strong downward-directing action could theoretically disturb fetal Qi. Additionally, excessive iron intake during pregnancy can cause gastrointestinal side effects. Should only be used during pregnancy under strict practitioner supervision and only when clearly indicated.

Breastfeeding

No specific classical prohibitions exist for breastfeeding. However, given the mineral nature of Sheng Tie Luo and the theoretical possibility that absorbed iron compounds could pass into breast milk, caution is advised. Its strong sedating and descending properties may not be appropriate for nursing mothers unless clearly needed. Use only under practitioner guidance during breastfeeding.

Children

Use with caution in children. The dosage should be significantly reduced according to the child's age and body weight, typically one-third to one-half of the adult dose. Classical sources such as the Ri Hua Zi Ben Cao mention using Sheng Tie Luo for pediatric conditions including fright epilepsy (惊邪癫痫) and ke wu (客忤, fright disorders in infants). However, because it is a heavy mineral substance with strong sedating properties, it should only be used in children for clear, acute indications and for short durations, under experienced practitioner supervision.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Sheng Tie Luo

Iron absorption medications: Sheng Tie Luo may interact with medications affected by concurrent iron intake. Tetracycline antibiotics, fluoroquinolones (ciprofloxacin, levofloxacin), and thyroid hormones (levothyroxine) can have their absorption significantly reduced by iron compounds. A minimum 2-hour separation is advisable.

Antacids and proton pump inhibitors: These medications alter gastric pH and may affect the dissolution and absorption of iron from Sheng Tie Luo.

Iron supplements: Concurrent use with iron supplements (ferrous sulfate, ferrous gluconate) may increase total iron intake and the risk of iron overload or gastrointestinal side effects.

Levodopa: Iron can reduce the absorption of levodopa, potentially diminishing its effectiveness in Parkinson's disease management.

Sedative and psychiatric medications: Given Sheng Tie Luo's documented sedative properties, concurrent use with benzodiazepines, antipsychotics, or other CNS depressants should be monitored for potential additive sedation.

Dietary Advice

Foods and dietary considerations when taking Sheng Tie Luo

While taking Sheng Tie Luo, avoid excessively cold and raw foods that might further burden the Spleen and Stomach, as this heavy mineral substance already places some digestive load. Tea should not be taken concurrently as the tannins in tea can bind with iron and reduce effectiveness. Avoid strongly spicy, greasy, or stimulating foods that may aggravate Heat or Phlegm-Fire conditions that Sheng Tie Luo is typically prescribed to treat. Light, easily digestible foods are preferred during treatment.

Botanical Description

Physical characteristics and morphology of the Sheng Tie Luo source mineral

Sheng Tie Luo (生铁落) is not a plant-derived substance. It is a mineral medicinal material consisting of the oxidized iron flakes (iron scale) that fall from red-hot cast iron when it is hammered on an anvil during traditional blacksmithing. When raw iron (生铁) is heated until red-hot, the outer layer oxidizes. The blacksmith's hammer strikes cause these oxidized flakes to chip off and scatter. These iron filings are then collected.

The substance is composed primarily of iron (II, III) oxide, known as magnetite (Fe3O4). The filings typically appear as irregular, thin, flattened flakes or small fragments, dark grey to brownish-black in colour, sometimes with a slight metallic lustre. They are heavy and hard, with no particular odour. With the decline of traditional ironworking, authentic Sheng Tie Luo has become increasingly difficult to source.

Sourcing & Harvesting

Where Sheng Tie Luo is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Not applicable. Sheng Tie Luo is collected as a byproduct during the iron forging process and is available year-round whenever blacksmithing or iron casting is performed.

Primary growing regions

Sheng Tie Luo is not a cultivated or harvested natural substance in the conventional sense. It is a byproduct of traditional iron smelting and blacksmithing, produced wherever cast iron is forged. Historically it was available throughout China wherever ironworking was practiced. There is no specific dao di (terroir) region, as quality depends on the iron source and forging process rather than geography. However, regions with historically significant iron smelting industries, such as Shanxi, Hebei, Henan, and Shandong provinces, were traditional sources.

Quality indicators

Good quality Sheng Tie Luo consists of thin, irregular flakes or small fragments that are dark grey to brownish-black in colour. They should feel heavy for their size and have a hard, brittle texture. The pieces should be clean and free of coal dust, soil, and other impurities from the forge. When struck together, they produce a metallic sound. Avoid material that is excessively rusted (reddish-brown throughout), as this indicates degradation to less desirable iron oxides. Authentic Sheng Tie Luo has no particular odour or taste. The vinegar-processed form (醋淬铁落) should have a faint vinegar smell.

Classical Texts

Key passages from the classical Chinese medical texts that describe Sheng Tie Luo and its therapeutic uses

Huang Di Nei Jing Su Wen (《素问》)

Original: 帝曰：有病怒狂者，此病安生？岐伯曰：生于阳也……以生铁落为饮。夫生铁落者，下气疾也。

Translation: The Yellow Emperor asked: "There are those who suffer from raging mania — where does this disease arise?" Qi Bo replied: "It arises from Yang... Use Sheng Tie Luo as a drink. Sheng Tie Luo rapidly descends Qi."

This is the earliest recorded use of Sheng Tie Luo in medicine, establishing its fundamental action of powerfully descending Qi and calming the spirit in states of manic agitation.

Ben Cao Jing Shu (《本草经疏》, Annotations on the Classic of Materia Medica)

Original: 铁落，本出于铁，不离金象，体重而降，故《素问》有生铁落饮，以疗病狂怒者，云生铁落，下气疾也。又怒狂属肝气暴升，故取金气以制之也。

Translation: "Iron filings originate from iron and do not depart from the nature of Metal. Being heavy in substance, they descend. This is why the Su Wen contains the Sheng Tie Luo Decoction for treating manic rage, stating that Sheng Tie Luo 'rapidly descends Qi.' Furthermore, raging mania belongs to the sudden uprising of Liver Qi, so the Metal nature [of iron] is employed to restrain it."

Ben Cao Gang Mu (《本草纲目》, Comperta of Materia Medica) — Li Shizhen

Original: 平肝去怯，治善怒发狂。

Translation: "Calms the Liver and dispels timidity; treats habitual anger and manic episodes."

Yi Lin Zuan Yao (《医林纂要》)

Original: 宁心神，泻妄火，坠涌痰。

Translation: "Calms the Heart spirit, drains reckless Fire, and sinks surging Phlegm downward."

Historical Context

The history and evolution of Sheng Tie Luo's use in Chinese medicine over the centuries

Sheng Tie Luo holds a unique place in Chinese medical history as one of the earliest recorded mineral medicines used specifically for psychiatric conditions. Its first documented use appears in the Huang Di Nei Jing Su Wen (the Inner Classic of the Yellow Emperor), making it one of the few medicinal substances directly mentioned in this foundational text. The passage describes using it as a decoction to treat "raging mania" arising from excess Yang, establishing its core therapeutic identity over two thousand years ago.

The name "铁落" literally means "iron droppings" or "fallen iron," referring to the oxidized flakes that drop from hot iron when struck by a blacksmith's hammer. Li Shizhen, in the Ben Cao Gang Mu, recorded that these sparks and flakes were popularly called "铁蛾" (tie e, "iron moths") because they flew through the air "like orchids or moths." He also explained the theoretical rationale using Five Phase theory: since rage and mania arise from Liver (Wood) Qi surging upward uncontrollably, iron (belonging to Metal) is the natural choice to restrain it, because Metal controls Wood in the restraining cycle. The Qing dynasty physician Cheng Guopeng (程国彭) composed the famous formula Sheng Tie Luo Yin (生铁落饮) in his 1732 work Yi Xue Xin Wu (Medical Revelations), combining Sheng Tie Luo with Phlegm-resolving, orifice-opening, and Yin-nourishing herbs to treat severe mania caused by Phlegm-Fire disturbing the Heart.