Herb Resin / Sap (树脂 shù zhī / 汁 zhī)

Bing Pian

Borneol · 冰片

Dryobalanops aromatica Gaertn. f. · Borneolum Syntheticum

Also known as: Long Nao (龙脑), Nao Zi (脑子), Mei Pian (梅片),

Bing Pian (Borneol) plant

Images shown are for educational purposes only

Borneol is an aromatic crystal with a strong cooling sensation, traditionally used to restore consciousness during emergencies like stroke or high fever with delirium. It is also widely applied topically for sore throat, mouth ulcers, red painful eyes, and skin sores. In many Chinese medicine formulas, it serves as a guide substance that helps other medicinal ingredients reach their target locations more effectively.

Category Aromatic substances that open the orifices (开窍药)
Therapeutic focus Emergency Care Eye Health and Vision Oral and throat health Skin and Wound Care Cardiovascular Health

TCM Properties

Temperature

Cool

Taste

Acrid / Pungent (辛 xīn), Bitter (苦 kǔ)

Channels entered

Heart, Spleen, Lungs

Parts used

Resin / Sap (树脂 shù zhī / 汁 zhī)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Herb Does

Every herb has a specific set of actions — here's what Bing Pian does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Bing Pian is primarily used to support these areas of health:

Emergency Care Eye Health and Vision Oral and throat health Skin and Wound Care Cardiovascular Health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Bing Pian performs to restore balance in the body:

Opens the Orifices and Revives Consciousness Clears Heat and Resolves Toxicity Brightens the Eyes and Removes Visual Obstructions Reduces Swelling and Alleviates Pain Promotes Tissue Regeneration and Heals Sores

How these actions work

'Opens the orifices and awakens the spirit' means Borneol can help restore consciousness when someone has fainted or become delirious due to high fever, stroke, or other acute conditions. Its intensely aromatic nature allows it to penetrate rapidly through the body's barriers, particularly the blood-brain barrier. While its orifice-opening power is less intense than that of Musk (She Xiang), the two are often used together for stronger effect. Because Borneol is cool in nature, it is especially suited for 'heat-type' loss of consciousness (hot closed conditions), though when combined with warming herbs it can also address cold-type emergencies.

'Clears Heat and relieves toxicity' refers to Borneol's ability to disperse accumulated Fire and toxic Heat, particularly in the head, throat, and eyes. This is why it appears in formulas for sore throat, mouth sores, and gum swelling. Its bitter, cool properties help it drain Heat from the Heart channel and upper body.

'Clears the eyes and removes visual obstruction' means Borneol is used for red, swollen, painful eyes and for corneal opacities (called 'visual obstructions' in traditional medicine). It is a key ingredient in many traditional eye preparations.

'Relieves pain and reduces swelling' applies particularly to topical use. Borneol provides a mild analgesic and antiseptic effect on sores, ulcers, burns, and traumatic injuries. It also has a unique ability to enhance the absorption of other medicines through the skin and mucous membranes, making topical treatments more effective.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Bing Pian is used to help correct these specific patterns.

Why Bing Pian addresses this pattern

When turbid Phlegm or pathogenic Heat blocks the Heart orifices, consciousness becomes clouded, leading to delirium or coma. Borneol's intensely aromatic, pungent nature allows it to cut through this obstruction and 'open' the blocked orifices. Its cool temperature makes it particularly effective when the blockage is caused by Heat (as in high fever with delirium), directly addressing the Heart channel where the spirit resides. As a cool orifice-opener, it disperses the Heat-Phlegm complex that clouds the mind.

A practitioner would look for one or more of these signs

Loss Of Consciousness

Sudden loss of consciousness from Heat or Phlegm obstruction

Delirium

Incoherent speech and restlessness with high fever

Convulsions

Convulsions in children from febrile conditions

Commonly Used For

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

Arises from: Fire-Toxin

TCM Interpretation

In TCM, sore throat is most often understood as Fire or Heat rising to the throat, an area where the Lung and Stomach channels converge. External Wind-Heat or accumulated internal Heat-Toxin can both cause the throat tissues to become red, swollen, and painful. The throat is considered especially vulnerable because it sits at the junction of the respiratory and digestive pathways, and many channels pass through it. When Fire-Toxin lodges there, it produces the acute swelling and intense pain characteristic of pharyngitis and tonsillitis.

Why Bing Pian Helps

Borneol directly clears Fire-Toxin from the throat through its bitter, cool nature. Applied topically (blown or sprinkled onto the affected area), its pungent quality disperses the stagnant Heat causing the swelling, while its cooling action calms the inflammation and relieves pain. Borneol also has demonstrated antibacterial properties and enhances the absorption of other topical medicines through the mucous membranes, making combination powders like Bing Peng San (Borneol and Borax Powder) particularly effective for rapid relief.

Also commonly used for

Red Eyes

Acute conjunctivitis, corneal opacity

Swollen Gums

Gingivitis, periodontal inflammation

Ear Discharge

Acute and chronic suppurative otitis media

Skin Burns

Thermal burns, applied topically

Chest Pain

Angina pectoris, as a component of cardiac emergency formulas

Ulcer

Non-healing sores and ulcers

Hemorrhoids

Topical application for hemorrhoidal pain and swelling

Herb Properties

Every herb 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), Bitter (苦 kǔ)

Channels Entered

Heart Spleen Lungs

Parts Used

Resin / Sap (树脂 shù zhī / 汁 zhī)

Dosage & Preparation

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

Standard dosage

0.15-0.3g, taken in pill or powder form. External use in appropriate amounts.

Maximum dosage

0.9g per day internally (Chinese Pharmacopoeia upper limit). Do not exceed this dose, as toxicity manifests at relatively low multiples of the clinical dose.

Dosage notes

Bing Pian is used at very small doses compared to most Chinese herbs. The standard internal dose is 0.15 to 0.3g per day, incorporated into pills or powders. It is never decocted in water, as it is a volatile crystalline substance that would sublimate and be lost with heat. For external use, the amount is adjusted to the condition: finely ground powder is applied directly to affected areas for mouth sores, throat conditions, eye problems, ear infections, skin lesions, or hemorrhoids. In eye preparations, extremely small amounts are used. In emergency orifice-opening formulas (such as An Gong Niu Huang Wan or Su He Xiang Wan), Bing Pian is one component among several and is dosed as part of the complete formula rather than individually. For chest pain (chest impediment/xiong bi), it is used at standard doses in combination with aromatic substances like Su He Xiang.

Preparation

Bing Pian must NEVER be decocted. It is a volatile crystalline substance that sublimes (passes directly from solid to gas) with heat, and would be completely lost in a standard decoction. It is always used in one of the following ways: - Ground into fine powder and incorporated into pills or powders for internal use - Dissolved into a strained decoction after it has been removed from heat (chong fu, 冲服) - Ground into extremely fine powder for topical application (blown onto throat, dusted onto sores, dissolved in oil for ear drops, or mixed into ointments) - Included as a pre-formulated ingredient in patent medicines (pills, capsules, drops) Store in tightly sealed containers in a cool place. Keep away from heat and flame, as it is flammable.

Common Herb Pairs

These ingredients are traditionally combined with Bing Pian for enhanced therapeutic effect

She Xiang
She Xiang 1:1 (equal parts, as in An Gong Niu Huang Wan where both are used at 7.5g)

Borneol and Musk (She Xiang) are the classical pairing for opening blocked orifices and reviving consciousness. Musk has the strongest orifice-opening power of all substances in Chinese medicine, while Borneol enhances this effect and adds its own cooling, Heat-clearing action. Together they penetrate more powerfully than either herb alone, breaking through even severe obstructions of the Heart orifices.

When to use: Acute loss of consciousness from stroke, high fever, encephalitis, or other emergencies where Phlegm-Heat blocks the Heart orifices. This pair forms the opening core of An Gong Niu Huang Wan and Zhi Bao Dan.

Peng Sha
Peng Sha 1:10 (Borneol 0.5g : Borax 5g, as in the classical Bing Peng San proportions)

Borneol clears Heat-Toxin and relieves pain with its aromatic penetrating quality, while Borax (Peng Sha) clears Heat, resolves Phlegm, and has antiseptic properties. Together they form a powerful topical combination for clearing Fire-Toxin and reducing swelling in the throat and mouth, with Borneol enhancing mucosal penetration of the Borax.

When to use: Sore throat, mouth ulcers, swollen gums, and other oral or pharyngeal inflammations from Fire-Toxin. This is the core pairing in Bing Peng San.

Huang Qi
Huang Qi 1:10 to 1:100 (Borneol is used in very small amounts relative to Huang Bai)

Borneol opens the orifices, disperses stagnant Fire, and relieves pain topically, while Huang Bai (Phellodendron bark) powerfully clears Heat, dries Dampness, and resolves toxicity. Combined, they provide both surface-level pain relief and deep Heat-clearing for oral and skin conditions, with Borneol enhancing Huang Bai's penetration into tissues.

When to use: Oral ulcers with Damp-Heat, mouth sores that are slow to heal, and throat pain. Classical sources pair Borneol with Huang Bai in pill form taken with Mai Men Dong decoction for dry mouth sores.

Niu Huang
Niu Huang Niu Huang 30g : Borneol 7.5g (as in An Gong Niu Huang Wan, approximately 4:1)

Niu Huang (Ox Gallstone) clears Heart Heat, resolves Phlegm, and calms the spirit, while Borneol opens orifices and helps guide other substances across the blood-brain barrier. Together they address both the root cause (Heat-Toxin and Phlegm in the Heart) and the mechanism of obstruction (blocked orifices), forming a comprehensive approach to heat-related loss of consciousness.

When to use: High fever with delirium, coma from febrile disease, encephalitis, or stroke with Heat signs. This is the foundational pairing in An Gong Niu Huang Wan.

Key Formulas

These well-known formulas feature Bing Pian in a prominent role

Bing Peng San 冰硼散 King

The defining topical formula for throat and mouth conditions. Borneol is the King herb here, directly showcasing its ability to clear Fire-Toxin from the oral cavity, relieve pain, and reduce swelling. Combined with Borax, Cinnabar, and Glauber's Salt, this simple powder is blown or applied onto sore throats, mouth ulcers, and swollen gums for rapid relief.

An Gong Niu Huang Wan 安宮牛黃丸 Assistant

The most famous emergency formula in Chinese medicine for heat-related coma and delirium. Borneol serves alongside Yu Jin as an aromatic assistant that opens the orifices and guides the formula's Heat-clearing ingredients (Niu Huang, Huang Lian, Huang Qin) across the blood-brain barrier to reach the obstructed Heart. This formula showcases Borneol's dual role as an orifice-opener and penetration enhancer.

Su He Xiang Wan 蘇合香丸 Assistant

This formula demonstrates Borneol's versatility: although it is cool in nature, it can be combined with warming orifice-openers (Su He Xiang, Musk) to treat cold closed conditions. Here Borneol serves as an assistant that enhances the formula's penetrating ability and helps guide the warming medicines to their targets in the brain and Heart, showcasing its role as a 'messenger drug.'

Comparable Ingredients

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

She Xiang
Bing Pian vs She Xiang

Both are aromatic orifice-opening substances used for loss of consciousness, but Musk (She Xiang) is warm and has a far stronger orifice-opening power, making it the primary choice for any type of closed condition. Borneol is cool and has weaker orifice-opening ability, but adds Heat-clearing action, making it better suited as an adjunct for hot closed conditions. Musk also strongly invigorates Blood and unblocks channels, actions that Borneol lacks. Due to resource scarcity and animal protection concerns, Musk is increasingly restricted, while Borneol remains widely available.

Su He Xiang
Bing Pian vs Su He Xiang

Both open orifices and restore consciousness, but Su He Xiang (Styrax) is warm and aromatic, specifically suited for cold closed conditions with chest and abdominal cold pain. Borneol is cool and better suited for hot closed conditions. Interestingly, both appear together in Su He Xiang Wan, where Su He Xiang provides the warming orifice-opening action and Borneol contributes its penetrating ability to help guide other medicines to their targets.

Shi Chang Pu
Bing Pian vs Shi Chang Pu

Both open orifices and address impaired consciousness, but Shi Chang Pu (Acorus) is warm and primarily resolves Phlegm-Dampness that clouds the mind, working more gradually over time. It is better suited for chronic conditions like mental fog, poor memory, and epilepsy. Borneol acts more acutely and is used primarily in emergencies. Shi Chang Pu also harmonises the Stomach and transforms Dampness, functions that Borneol does not share.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Bing Pian

The most common substitution issue is the use of synthetic borneol (Ji Zhi Bing Pian, racemic dl-borneol) in place of natural borneol. Synthetic borneol contains significant amounts of isoborneol, which has higher toxicity than borneol and increases further as the product degrades during storage. Key distinguishing features: natural borneol produces little or no black smoke when burned, while synthetic borneol produces noticeable black smoke. Natural borneol crystals are harder and less layered, while synthetic borneol is more brittle with visible layering and ice-crack patterns on the surface. Ai Pian (L-borneol from Blumea balsamifera) and Tian Ran Bing Pian (D-borneol from Cinnamomum camphora) are sometimes used interchangeably despite having different stereochemistry and somewhat different pharmacological profiles. Both are classified as natural borneol in the Chinese Pharmacopoeia but are listed as separate entries. Camphor (Zhang Nao) is a related but distinct substance that should never be substituted for Bing Pian. While they share a similar aroma and are chemically related (camphor is actually the principal metabolite of borneol), camphor has significantly different therapeutic properties and higher toxicity.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Bing Pian

Slightly toxic

Synthetic borneol (He Cheng Bing Pian) contains significant amounts of isoborneol, which has a higher LD50 toxicity than borneol itself. Isoborneol content increases as synthetic borneol degrades during storage, with camphor impurities potentially reaching very high levels. Natural borneol (both D-borneol and L-borneol) has a better safety profile than synthetic borneol. Toxicity from overdose manifests as gastrointestinal irritation (nausea, vomiting, abdominal pain), enlargement of the liver and spleen, central nervous system excitation progressing to convulsions, loss of consciousness, and spasms. In severe cases, respiratory failure and death can occur. Safe use requires strict adherence to the recommended dosage range of 0.15 to 0.3g (maximum 0.9g) for internal use. It should only be taken in pill or powder form, never decocted, as its volatile nature means the active compound would be lost. Natural borneol is preferred over synthetic for internal use and for application to mucous membranes.

Contraindications

Situations where Bing Pian should not be used or requires extra caution

Avoid

Pregnancy: Bing Pian has demonstrated reproductive toxicity in animal studies. At doses only 4 times the clinical upper limit, it caused maternal death in pregnant mice. It has been used historically to aid difficult labor, suggesting uterine-stimulating properties. The Chinese Pharmacopoeia advises caution in pregnancy.

Avoid

Qi and Blood deficiency: Bing Pian is strongly dispersing and dissipating in nature. In people with underlying Qi or Blood deficiency, it can further scatter the body's vital substances, worsening exhaustion. Classical texts specifically warn against its use in stroke caused by internal deficiency rather than external Wind.

Caution

Cold-type (Yin) collapse or cold-pattern coma when used alone: Bing Pian is slightly cold in nature and is classified as a 'cool opening' substance. Used alone in cold-collapse conditions, it may worsen the situation. It must be combined with warming herbs if used in cold-type loss of consciousness.

Avoid

Chronic slow-onset childhood convulsions (man jing, 慢惊): The Ben Cao Jing Shu specifically warns that slow convulsions in children due to Spleen deficiency (often after prolonged vomiting and diarrhea) are a cold-deficiency pattern and Bing Pian must not be used. Only acute, hot-type convulsions are appropriate.

Caution

Eye conditions due to Liver-Kidney deficiency: When dim vision or eye problems stem from deficiency of Liver and Kidney rather than Heat, Bing Pian eye drops or eye powders should not be applied, as the cold dispersing nature will worsen the underlying deficiency.

Caution

Prolonged or excessive internal use: As an aromatic orifice-opening herb, Bing Pian is meant for short-term or acute use. Extended oral consumption can irritate the gastrointestinal tract and deplete Qi through excessive dispersal.

Caution

Overdose risk: Excessive doses can cause gastrointestinal irritation (nausea, vomiting, abdominal pain), central nervous system excitation leading to convulsions, and in severe cases respiratory failure.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Contraindicated in pregnancy. The Ming Yi Bie Lu records Bing Pian being used to treat difficult labor, suggesting it has uterine-stimulating properties. Animal reproductive toxicity studies have shown that both natural borneol (Ai Pian) and synthetic borneol caused maternal death at doses only 4 times the Chinese Pharmacopoeia's upper clinical dose limit of 0.9g per day. The no-observable-adverse-effect level (NOAEL) in pregnant mice was approximately equivalent to 3.6g per day in humans, giving a narrow safety margin. Mid-trimester studies have shown borneol has abortifacient activity. The Chinese Pharmacopoeia lists pregnancy as a caution for this herb.

Breastfeeding

Insufficient safety data exists for Bing Pian use during breastfeeding. As a highly volatile and lipid-soluble monoterpene, borneol can readily pass biological membranes and could potentially transfer into breast milk. Its aromatic, dispersing nature and slight toxicity classification warrant caution. Topical use on areas away from the breast in small amounts is less concerning, but internal use should be avoided during breastfeeding unless specifically directed by a qualified practitioner.

Children

Bing Pian can be used in children for acute hot-type convulsions (acute fright wind) as part of classical formulas like An Gong Niu Huang Wan, but dosages must be substantially reduced according to age and weight. It is strictly contraindicated in slow-onset convulsions in children (man jing / chronic Spleen Wind), which typically follow prolonged vomiting and diarrhea and represent a cold-deficiency pattern. Classical texts are emphatic on this distinction. Topical use for mouth sores, eye conditions, or ear infections in children follows similar principles as in adults but with reduced amounts. Internal use in young children should only occur under qualified practitioner supervision due to the narrow therapeutic window.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Bing Pian

Anticoagulant and antiplatelet medications: Bing Pian may have mild antiplatelet activity. Caution is warranted when combining with warfarin, heparin, aspirin, or clopidogrel, as there is a theoretical risk of increased bleeding.

Blood-brain barrier penetration enhancement: Modern research has demonstrated that borneol significantly enhances the permeability of the blood-brain barrier by modulating P-glycoprotein and tight junction proteins. This means it could potentially increase brain concentrations of co-administered CNS-active drugs, including sedatives, antiepileptics, and antidepressants. While this property is therapeutically exploited in TCM, it could cause unexpected potentiation of pharmaceutical CNS drugs.

Transdermal drug absorption: Borneol is a well-documented penetration enhancer for topical drugs, including corticosteroids and NSAIDs. If applied topically alongside pharmaceutical transdermal preparations, it could increase their absorption beyond intended levels.

CYP450 enzyme interactions: Borneol is metabolized via CYP2A6, CYP2B6, and CYP3A pathways and undergoes UGT2B7-mediated glucuronidation. It may therefore interact with drugs that are substrates or inhibitors of these enzymes, though clinical significance has not been fully established.

Dietary Advice

Foods and dietary considerations when taking Bing Pian

While taking Bing Pian internally, avoid excessively greasy, heavy, or difficult-to-digest foods, as these can generate Phlegm and counteract the herb's orifice-opening action. Since Bing Pian is slightly cold in nature, people with cold Spleen and Stomach should be mindful of not also consuming large amounts of cold, raw foods that could compound digestive discomfort. Alcohol in moderation is not specifically contraindicated and was historically used as a vehicle for some Bing Pian preparations.

Botanical Description

Physical characteristics and morphology of the Bing Pian source plant

Bing Pian (borneol) is not derived from a single plant species but from several botanical sources. The original and most prized source is Dryobalanops aromatica (Dipterocarpaceae family), a massive evergreen tree of tropical Southeast Asian rainforests that can reach over 50 meters tall with a straight trunk and buttressed base. Natural crystals of borneol form in crevices and hollows of the heartwood. This tree is now rare due to historical overexploitation.

The most common modern natural source is Cinnamomum camphora (Lauraceae), specifically borneol-type camphor trees native to southern China. These are medium to large evergreen trees with aromatic glossy leaves and small yellowish flowers. Another important source is Blumea balsamifera (Asteraceae), known as Ai Na Xiang, a large perennial herb or subshrub growing 1 to 3 meters tall with soft, fragrant, densely hairy leaves. Its leaves are steam-distilled to produce the product known as Ai Pian (left-rotatory borneol). Synthetic borneol (Ji Zhi Bing Pian) is also widely produced from turpentine oil or camphor through chemical synthesis.

Sourcing & Harvesting

Where Bing Pian is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Year-round, as borneol is extracted from tree resin, branches, or leaves through steam distillation and crystallization. For Blumea balsamifera (Ai Pian source), leaves are typically harvested in summer and autumn when essential oil content is highest.

Primary growing regions

Natural borneol (Tian Ran Bing Pian) from Cinnamomum camphora: primarily produced in Jiangxi, Fujian, Hunan, and Sichuan provinces of China. Borneol-producing camphor trees (Long Nao Zhang) are concentrated in these southern regions. Ai Pian (from Blumea balsamifera): mainly produced in Guizhou, Guangxi, Guangdong, and Yunnan provinces, as well as Hainan Island in southern China. Original Dryobalanops aromatica borneol (Long Nao Xiang): historically imported from Southeast Asia (Borneo/Kalimantan, Sumatra), now extremely rare and essentially unavailable commercially. Synthetic borneol (Ji Zhi Bing Pian): produced industrially throughout China from turpentine oil or camphor, representing the majority of commercial supply.

Quality indicators

Good quality natural Bing Pian (whether Tian Ran Bing Pian or Mei Pian) appears as translucent to white, flake-like or granular crystals. The pieces should be large, thin, and cleanly white. The aroma should be pure, fresh, and distinctly fragrant (camphor-like but cleaner and more refined). The taste is pungent and cooling, and the crystals should slowly dissolve when chewed. When burned, high-quality natural borneol produces little or no black smoke. Synthetic borneol, by contrast, typically produces noticeable black smoke when burned, which is a key distinguishing test. Natural borneol (D-borneol) should have a purity of at least 96% per Chinese Pharmacopoeia standards. L-borneol (Ai Pian) requires at least 85% purity. Synthetic borneol need only be 55% pure, and often contains significant isoborneol. Avoid crystals that are yellowish, have a harsh or unpleasant chemical smell, or feel sticky. Store in sealed containers in a cool place, as Bing Pian is highly volatile and will sublimate (evaporate directly from solid to gas) at room temperature if left unsealed.

Classical Texts

Key passages from the classical Chinese medical texts that describe Bing Pian and its therapeutic uses

Ming Yi Bie Lu (名医别录) — Wei-Jin period

Original: 妇人难产，取龙脑研末少许，以新汲水调服。

Translation: For women with difficult labor, take a small amount of Long Nao (borneol) ground to powder, and administer mixed with freshly drawn water.

Xin Xiu Ben Cao (新修本草, Tang Dynasty Materia Medica)

Original: 主心腹邪气，风湿积聚，耳聋。明目，去目赤肤翳。

Translation: It treats pathogenic Qi in the chest and abdomen, accumulations due to Wind-Damp, and deafness. It brightens the eyes and removes redness and superficial visual obstructions.

Ben Cao Gang Mu (本草纲目) — Li Shizhen

Original: 疗喉痹，脑痛，鼻息，齿痛，伤寒舌出，小儿痘陷。通诸窍，散郁火。

Translation: It treats sore throat obstruction, headache, nasal polyps, toothache, tongue protrusion in Cold Damage disease, and sunken pox lesions in children. It opens all the orifices and disperses constrained Fire.

Yi Lin Zuan Yao (医林纂要)

Original: 冰片主散郁火，能透骨热，治惊痫、痰迷、喉痹，舌胀、牙痛、耳聋、鼻息、目赤浮翳、痘毒内陷、杀虫、痔疮、催生，性走而不守，亦能生肌止痛。然散而易竭，是终归阴寒也。

Translation: Bing Pian mainly disperses constrained Fire, can penetrate bone-level Heat, and treats fright epilepsy, Phlegm clouding, throat obstruction, tongue swelling, toothache, deafness, nasal polyps, red eyes with superficial opacity, inward-sinking pox toxin, kills parasites, hemorrhoids, and hastens labor. Its nature is mobile and does not stay in one place; it can also regenerate flesh and stop pain. However, being so dispersing, it easily depletes, and its ultimate tendency is toward Yin and cold.

Ben Cao Jing Shu (本草经疏)

Original: 凡中风非外来之风邪，乃因气血虚而病者忌之；小儿吐泻后成惊者为慢脾风，切不可服，急惊属实热可用，慢惊属虚寒不可用；眼目昏暗属肝肾虚者不宜入点药。

Translation: In all cases of stroke that are not caused by external Wind pathogen but rather arise from Qi and Blood deficiency, this herb is contraindicated. When children develop convulsions after prolonged vomiting and diarrhea (slow Spleen Wind), it absolutely must not be taken. Acute convulsions from excess Heat may use it, but slow convulsions from deficiency-cold must not. For dim vision due to Liver and Kidney deficiency, it should not be used in eye preparations.

Historical Context

The history and evolution of Bing Pian's use in Chinese medicine over the centuries

Bing Pian has a rich history spanning over 1,500 years of documented use. It was originally imported into China during the Han Dynasty from Kalimantan Island (Borneo), and the Western name 'borneol' likely derives from this geographic origin. It first appeared in Chinese medical literature in the Ming Yi Bie Lu (名医别录) during the Wei-Jin period under the name Long Nao (龙脑, 'dragon brain'), a name reflecting the prized crystals found deep within ancient Dryobalanops trees, as if hidden in the 'brain' of a dragon. The Xin Xiu Ben Cao (Tang Dynasty) formally recorded it under the name Long Nao Xiang (龙脑香).

The name 'Bing Pian' (冰片, literally 'ice flakes') first appeared in the Ming Dynasty, with the earliest recorded use of this term found in Chen Jiamo's Ben Cao Meng Quan (本草蒙筌). The name poetically describes its appearance: translucent, crystalline flakes resembling fragments of ice. Over time, 'Bing Pian' replaced 'Long Nao Xiang' as the standard name. Throughout Chinese history, natural borneol from Dryobalanops was extremely expensive, rivaling precious gems. The scarcity of imported dragon-brain borneol drove the development of domestic alternatives, first from Blumea balsamifera (Ai Pian, used since at least the 19th century in Guangdong and Guangxi), and later from Chinese camphor trees (Tian Ran Bing Pian). Modern synthetic production began in the 20th century to meet pharmaceutical demand. Today, Bing Pian is a key ingredient in many famous patent medicines including An Gong Niu Huang Wan, Su He Xiang Wan, Su Xiao Jiu Xin Wan (Rapid Heart Rescue Pills), and Fu Fang Dan Shen Di Wan (Compound Danshen Dripping Pills).

Modern Research

5 published studies investigating the pharmacological effects or clinical outcomes of Bing Pian

1

Randomized double-blind placebo-controlled clinical trial on topical borneol analgesia (2017)

Wei G, Chen Y, Zheng Y, et al. A clinical and mechanistic study of topical borneol-induced analgesia. EMBO Molecular Medicine, 2017, 9(6): 802-820.

A rigorous clinical trial involving 122 patients with postoperative pain found that topical application of borneol led to significantly greater pain relief than placebo. The study identified the TRPM8 channel as a key molecular target mediating borneol's analgesic effect, providing a modern scientific basis for its traditional 'clearing Heat and relieving pain' action.

PubMed
2

Comprehensive review of borneol stereoisomer pharmacology and safety comparison (2023)

Ma R, Lu D, Wang J, Xie Q, Guo J. Comparison of pharmacological activity and safety of different stereochemical configurations of borneol. Biomedicine & Pharmacotherapy, 2023, 164: 114668.

This systematic review compared the pharmacological activity and safety of L-borneol (Ai Pian), D-borneol (Tian Ran Bing Pian), and synthetic borneol across multiple databases. It found that L-borneol has better potential in cerebrovascular disease treatment and bacterial inhibition, while D-borneol showed superior antitumor sensitizing effects. Synthetic borneol was confirmed to be less safe overall than natural forms.

3

Review of borneol as a blood-brain barrier permeability enhancer for CNS drug delivery (2017)

Zhang QL, Fu BM, Zhang ZJ. Borneol, a novel agent that improves central nervous system drug delivery by enhancing blood-brain barrier permeability. Drug Delivery, 2017, 24(1): 1037-1044.

This comprehensive review examined the modern pharmacological basis for borneol's traditional 'orifice-opening' function. It found that borneol can rapidly cross and transiently open the blood-brain barrier by modulating ABC transporters (including P-glycoprotein), loosening tight junction proteins, and enhancing vasodilatory neurotransmitters. This provides a scientific explanation for its classical role as a 'guide drug' that leads other medicines to the brain.

4

Borneol metabolites ameliorate atherosclerosis via foam cell inhibition (2024)

Circulating metabolites of Borneolum syntheticum (Bingpian) ameliorate atherosclerosis in ApoE-/- mice via inhibiting macrophage foam-cell formation. Acta Pharmacologica Sinica, 2024.

This translational study examined borneol's cardiovascular effects in both humans and mice. After oral administration, borneol undergoes extensive first-pass metabolism to glucuronide conjugates that become the major circulating compounds. These metabolites inhibited macrophage foam-cell formation in vitro, and 12 weeks of borneol administration significantly decreased atherosclerotic lesion size and improved plaque stability in ApoE-knockout mice.

PubMed
5

Neuroprotection by borneol against oxygen-glucose deprivation injury in cortical neurons (2011)

Liu R, Zhang L, Lan X, Li L, Zhang TT, Sun JH, Du GH. Protection by borneol on cortical neurons against oxygen-glucose deprivation/reperfusion. Neuroscience, 2011, 176: 408-419.

This preclinical study demonstrated that borneol protected cortical neurons against oxygen-glucose deprivation and reperfusion injury (a model of stroke). The protective mechanism involved anti-oxidation and anti-inflammatory effects mediated through the NF-kappaB signaling pathway, supporting borneol's traditional use in stroke-related conditions.

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.