Herb Resin / Sap (树脂 shù zhī / 汁 zhī)

Ru Xiang

Frankincense resin · 乳香

Boswellia carterii Birdw. · Olibanum

Also known as: Olibanum, Frankincense, Xūn Lù Xiāng (熏陆香),

Ru Xiang (Frankincense resin) plant

Images shown are for educational purposes only

Frankincense resin is one of Chinese medicine's most important herbs for pain relief. It works by promoting healthy circulation of both Qi and Blood, making it useful for a wide range of painful conditions including joint pain, traumatic injuries, menstrual cramps, and slow-healing wounds. It is very often paired with Myrrh (Mò Yào) to enhance its effects.

Category Blood-invigorating and stasis-dispelling herbs (活血化瘀药) Blood-invigorating and pain-relieving herbs (活血止痛药)
Therapeutic focus Pain Management Joint and Muscle Health Skin and Wound Care Women's Reproductive Health Circulation Support

TCM Properties

Temperature

Warm

Taste

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

Channels entered

Heart, Liver, Spleen

Parts used

Resin / Sap (树脂 shù zhī / 汁 zhī)

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What This Herb Does

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

Therapeutic focus

In practical terms, Ru Xiang is primarily used to support these areas of health:

Pain Management Joint and Muscle Health Skin and Wound Care Women's Reproductive Health Circulation Support

TCM Actions

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

Invigorates Blood and Moves Qi Alleviates Pain Reduces Swelling Promotes Tissue Regeneration and Heals Sores Relaxes the Sinews and Unblocks the Collaterals

How these actions work

'Invigorates Blood and moves Qi' means Rǔ Xiāng gets stagnant Blood and Qi flowing again. Its pungent taste disperses and its warm nature helps open blocked pathways. Because it enters both the Blood level and the Qi level simultaneously, it is especially useful when pain is caused by a combination of Qi stagnation and Blood stasis. This is why it appears so often in formulas for chest pain, abdominal pain, menstrual pain, and traumatic injuries.

'Alleviates pain' is Rǔ Xiāng's most celebrated action. The classical teaching "不通则痛" ("where there is blockage, there is pain") explains why: by unblocking stagnant Qi and Blood, Rǔ Xiāng addresses the root cause of many types of pain. It is effective for pain throughout the body, including joint pain from Wind-Damp obstruction (Bi syndrome), chest pain, epigastric pain, menstrual cramping, and pain from physical trauma.

'Reduces swelling and promotes tissue regeneration' refers to its ability to help resolve swollen, inflamed tissue (especially in abscesses and sores) and to encourage the growth of new flesh in wounds that are slow to heal. This is why it is considered an essential herb in surgical medicine (外科要药). It is used both internally and externally: taken internally for early-stage abscesses to reduce swelling, and applied topically as powder for chronic ulcers or non-healing wounds.

'Relaxes the sinews and invigorates the channels' means it helps loosen tight, cramped muscles and tendons and restores proper flow through the body's channel network. This action makes it useful for conditions like joint stiffness, muscle spasm, and limb numbness caused by Wind-Damp or blood stasis obstructing the channels.

Patterns Addressed

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

Why Ru Xiang addresses this pattern

Rǔ Xiāng is pungent, bitter, and warm, entering the Heart, Liver, and Spleen channels. Its pungent taste disperses stagnation while its warmth promotes movement. It works simultaneously on both the Qi and Blood levels, which is critical because in Blood Stagnation, Qi stagnation is almost always involved (Qi is the motive force for Blood). By moving Qi within the Blood, Rǔ Xiāng breaks up stasis and restores circulation, directly addressing the core pathomechanism of this pattern.

A practitioner would look for one or more of these signs

Sharp Stabbing Pain

Fixed, stabbing pain that worsens with pressure

Trauma

Swelling and bruising from physical trauma

Amenorrhea

Menstrual pain with dark clotted blood

Abdominal Pain

Abdominal masses or pain due to stasis

Commonly Used For

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

Arises from: Wind-Damp

TCM Interpretation

TCM views osteoarthritis primarily as a Bi syndrome (painful obstruction). Over time, Wind, Cold, and Dampness invade the channels around the joints, and the resulting stagnation of Qi and Blood leads to pain, swelling, and reduced mobility. In chronic cases, the long-standing obstruction generates phlegm and Blood stasis that lodge in the joints, causing the bony deformities and stiffness characteristic of this condition. The Liver (which governs sinews) and Kidneys (which govern bones) are the organ systems most involved.

Why Ru Xiang Helps

Rǔ Xiāng's warm, pungent nature helps disperse the Cold-Damp obstruction in the channels while its Blood-invigorating action clears the secondary Blood stasis that accumulates around affected joints. Its specific ability to relax sinews and invigorate channels addresses the stiffness and restricted movement. Modern research on boswellic acids, the active compounds in frankincense resin, has demonstrated anti-inflammatory effects comparable to NSAIDs, supporting its traditional use for joint inflammation and pain.

Also commonly used for

Rheumatoid Arthritis

Joint inflammation and pain from Bi syndrome

Angina

Chest pain from Blood stasis

Chronic Wounds

Non-healing ulcers and slow wound closure

Skin Abscess

Carbuncles and abscesses in early stages

Sciatica

Radicular pain along the lower limb

Frozen Shoulder

Shoulder stiffness and pain

Epigastric Pain Relieved With Pressure Or Eating

Stomach pain from Qi and Blood stasis

Herb Properties

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

Temperature

Warm

Taste

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

Channels Entered

Heart Liver Spleen

Parts Used

Resin / Sap (树脂 shù zhī / 汁 zhī)

Dosage & Preparation

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

Standard dosage

3-10g

Maximum dosage

Up to 10g in decoction for severe pain conditions, under practitioner supervision. External use dosage is flexible and adjusted to the affected area.

Dosage notes

For internal use in decoctions, the standard range is 3-5g (some sources extend to 10g). Lower doses (3-5g) are typical when used for general Blood-moving and pain-relieving purposes. The herb is more commonly used in pills and powders than in decoctions, as it tends to make the decoction liquid cloudy and can provoke nausea. For external application (ground into powder and applied to wounds, sores, or swollen areas), the dosage is adjusted as needed. Zhang Xichun specifically advocated using Ru Xiang raw (生用) rather than stir-fried, arguing that processing significantly reduces its Blood-moving potency. However, most modern clinical practice favors vinegar-processed Ru Xiang (醋乳香) for internal use to reduce gastric irritation. The choice between raw and processed forms should be guided by the clinical situation and the patient's digestive tolerance.

Preparation

When used in decoctions, Ru Xiang should be added toward the end of cooking (后下, hou xia) because prolonged boiling drives off the volatile oils that contribute to its therapeutic action. However, Ru Xiang is more commonly used in pill, powder, or external preparations than in decoctions. For pills and powders, the classical method involves lightly warming the resin until it partially melts, then grinding it into fine powder once cooled. Vinegar-processing (醋炙) is the standard method to reduce gastrointestinal irritation for internal use.

Processing Methods

In TCM, the same herb can be prepared in different ways to change its effects — here's how processing alters what Ru Xiang does

Processing method

The raw resin is dry-fried over gentle heat until it smokes, the surface turns dark brown with an oily sheen, then removed and cooled.

How it changes properties

Stir-frying reduces the resin's irritating effect on the stomach (which can cause nausea and vomiting) and makes it easier to grind into powder. The core thermal nature and actions remain similar, but the harsh aromatic quality is tempered. The Blood-invigorating action is slightly moderated.

When to use this form

Preferred for internal use whenever the raw form causes gastrointestinal discomfort. Most practitioners default to processed forms for oral administration.

Common Herb Pairs

These ingredients are traditionally combined with Ru Xiang for enhanced therapeutic effect

Mo Yao
Mo Yao 1:1 (equal amounts, typically 3-5g each)

The most classical and essential pairing in all of Chinese medicine for pain. Rǔ Xiāng excels at moving Qi within the Blood and relaxing sinews, while Mò Yào (Myrrh) excels at dispersing Blood stasis directly. Together they cover both the Qi and Blood dimensions of obstruction, producing a synergistic analgesic and anti-swelling effect far greater than either alone. As the Ben Cao Gang Mu states, they are virtually always used together.

When to use: Any condition involving Qi stagnation and Blood stasis causing pain: traumatic injuries, joint pain, menstrual cramps, chest pain, abdominal pain, or sores and abscesses. Also used topically as powder for chronic non-healing wounds.

Dang Gui
Dang Gui 1:1 (e.g. 5g each in Huó Luò Xiào Líng Dān)

Rǔ Xiāng invigorates Blood and moves Qi with its aromatic, dispersing quality, while Dāng Guī nourishes and activates Blood simultaneously. This pairing strengthens the ability to dispel stasis and stop pain while protecting the Blood from being depleted by the moving action of Rǔ Xiāng. The combination addresses the interdependence of Blood nourishment and Blood movement.

When to use: Blood stasis pain conditions where the patient also has some degree of Blood deficiency, such as menstrual pain, postpartum abdominal pain, or chronic pain with a pale complexion. Both herbs appear together in Huó Luò Xiào Líng Dān.

Dan Shen
Dan Shen 1:1 (e.g. 15g each)

Dān Shēn is a powerful Blood-invigorating herb that is also slightly cool, balancing Rǔ Xiāng's warmth. Together with Rǔ Xiāng and Mò Yào, they form the core of Huó Luò Xiào Líng Dān, addressing Blood stasis throughout the body while preventing the formula from becoming excessively warm.

When to use: Widespread Blood stasis with pain in multiple locations, especially when there may be some Heat component. Commonly used for cardiac chest pain, abdominal masses, and chronic pain syndromes.

Xue Jie
Xue Jie Xuè Jié in larger proportion (e.g. in Qī Lí Sǎn: Xuè Jié 30g, Rǔ Xiāng 4.5g)

Xuè Jié (Dragon's Blood resin) powerfully disperses stasis and stops bleeding, complementing Rǔ Xiāng's Qi-moving and tissue-regenerating actions. Together they create a strong anti-stasis, wound-healing combination used in trauma medicine.

When to use: Acute traumatic injuries with bleeding, bruising, swelling, and severe pain. Both appear together in Qī Lí Sǎn, the classic trauma powder.

Key Formulas

These well-known formulas feature Ru Xiang in a prominent role

Huo Luo Xiao Ling Dan 活絡效靈丹 King

This is Rǔ Xiāng's signature formula, created by Zhang Xichun. It contains just four herbs: Dāng Guī, Dān Shēn, Rǔ Xiāng, and Mò Yào in equal parts. Rǔ Xiāng and Mò Yào serve as the core pair driving the formula's Blood-invigorating and pain-relieving action. It treats virtually any pain caused by Qi and Blood stasis throughout the body, showcasing Rǔ Xiāng's broad analgesic capacity.

Xian Fang Huo Ming Yin 仙方活命飲 Deputy

The most famous formula in Chinese surgical medicine, called 'the premier formula for sores and abscesses.' Rǔ Xiāng serves as Deputy alongside Mò Yào, contributing its Blood-moving, swelling-reducing, and tissue-regenerating actions to treat early-stage carbuncles and abscesses. This formula perfectly demonstrates Rǔ Xiāng's role as an essential surgical herb.

Qi Li San 七厘散 Assistant

The classic trauma powder from Liáng Fāng Jí Yì, used for falls, fractures, and contusions. Rǔ Xiāng works alongside Mò Yào, Xuè Jié, and Hóng Huā to dispel stasis, reduce swelling, and stop pain. This formula showcases Rǔ Xiāng's importance in traumatology.

Xiao Huo Luo Dan 小活絡丹 Assistant

From the Tài Píng Huì Mín Hé Jì Jú Fāng, this formula treats Wind-Cold-Damp Bi syndrome with phlegm and stasis obstructing the channels. Rǔ Xiāng and Mò Yào serve as Assistants, contributing Blood-invigorating and channel-opening actions alongside the powerful Wind-Cold dispelling action of Chuān Wū and Cǎo Wū. This demonstrates Rǔ Xiāng's role in treating Bi syndrome.

Comparable Ingredients

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

Mo Yao
Ru Xiang vs Mo Yao

Both invigorate Blood, alleviate pain, reduce swelling, and promote tissue regeneration, and they are almost always used together. The key difference: Rǔ Xiāng is stronger at moving Qi and relaxing the sinews (making it better for stiffness and muscle spasm), while Mò Yào is stronger at dispersing Blood stasis directly (making it better when stasis is the dominant issue). Rǔ Xiāng is warm; Mò Yào is considered neutral to slightly warm. Rǔ Xiāng is described as working 'within the Blood to move Qi' while Mò Yào works 'within the Qi to move Blood.'

Yan Hu Suo
Ru Xiang vs Yan Hu Suo

Both are premier pain-relieving herbs that move Qi and Blood. Yán Hú Suǒ (Corydalis) is generally considered stronger for pure analgesic effect and enters the Liver, Spleen, and Heart channels similarly. However, Rǔ Xiāng has the additional ability to reduce swelling and promote tissue regeneration (generating flesh), making it more suitable for surgical conditions, sores, and trauma. Yán Hú Suǒ is preferred when pain relief is the sole priority, especially for visceral pain.

Xue Jie
Ru Xiang vs Xue Jie

Both are resinous substances that invigorate Blood and promote healing. Xuè Jié (Dragon's Blood) is stronger at stopping bleeding and is primarily used in trauma formulas, while Rǔ Xiāng has a broader scope of action including Qi movement, sinew relaxation, and channel invigoration. For trauma with active bleeding, Xuè Jié is preferred; for stiffness and Bi syndrome, Rǔ Xiāng is more appropriate.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Ru Xiang

Ru Xiang is sometimes adulterated with or confused with the following: 1. Boswellia species variation: Resin from Boswellia frereana and Boswellia papyrifera may be sold alongside or mixed with authentic B. carterii/B. sacra material. Their chemical profiles differ significantly; for example, B. frereana lacks significant boswellic acid content. 2. Synthetic or diluted resins: Lower-grade commercial product may be mixed with other tree resins (such as colophony/pine rosin) to increase volume. Authentic Ru Xiang can be distinguished by its characteristic fragrance and the fact that it produces a white, milky emulsion when chewed (it should not dissolve into a clear liquid). 3. Confusion with Mo Yao (Myrrh): Since the two herbs are so frequently used together, they can sometimes be confused in bulk. Mo Yao is reddish-brown to dark brown and has a more bitter, acrid taste, while Ru Xiang is yellowish-white and more aromatic. 4. B. serrata (Indian frankincense) resin is sometimes used as a substitute. While pharmacologically active, it is botanically distinct from the official Chinese Pharmacopoeia sources (B. carterii and B. bhaw-dajiana) and has a different boswellic acid profile.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Ru Xiang

Slightly toxic

The Ri Hua Zi Ben Cao (日华子本草) classified Ru Xiang as 'slightly toxic' (微毒). The main concern is gastrointestinal irritation rather than systemic poisoning. Common adverse reactions from oral use include nausea, vomiting, stomach discomfort, and diarrhea. These effects are dose-dependent and more common in people with weak digestion. At higher doses (around 6g raw herb per kg body weight in animal studies), some degree of liver stress has been observed, though the isolated boswellic acids did not show the same hepatotoxic potential, suggesting the crude resin contains other irritant components. Processing (炮制) significantly reduces the irritant properties. Vinegar-frying (醋炙) or stir-frying until the surface darkens reduces the volatile oil content responsible for gastric irritation and makes the herb gentler on the stomach. For this reason, processed Ru Xiang (Zhi Ru Xiang 制乳香 or Cu Ru Xiang 醋乳香) is preferred for internal use. Allergic skin reactions are also occasionally reported.

Contraindications

Situations where Ru Xiang should not be used or requires extra caution

Avoid

Pregnancy: Ru Xiang invigorates Blood and moves Qi, which can stimulate uterine contractions and potentially harm the fetus. Classical sources explicitly state that pregnant women should not take this herb (孕妇忌服).

Avoid

Active hemorrhage or bleeding disorders: As a Blood-invigorating herb, Ru Xiang can worsen bleeding. People with hemorrhagic conditions or those on anticoagulant medications should avoid use without professional supervision.

Caution

Ulcerated sores that are already open and draining pus: The classical Ben Cao Jing Shu states that once an abscess has ruptured, or when sores are producing significant pus, Ru Xiang should not be taken internally.

Caution

Weak Stomach or Spleen deficiency: Ru Xiang is bitter and aromatic, and can irritate the digestive tract, causing nausea, vomiting, or stomach pain. Those with a weak digestive system should use small doses or avoid it. The Ben Jing Feng Yuan warns: 'Do not use if the Stomach is weak' (胃弱勿用).

Caution

Blood deficiency or Qi-Blood dual deficiency without Blood stasis: As an invigorating and moving herb, Ru Xiang can consume Qi and Blood. It should not be used as a standalone remedy in deficiency patterns where no stagnation is present.

Caution

Yin deficiency with Heat signs: Ru Xiang is warm in nature. Those with internal Heat from Yin deficiency should use it with caution to avoid aggravating their condition.

Caution

Menstruation with heavy flow and no Blood stasis: Since Ru Xiang moves Blood, it may increase menstrual bleeding in women who already have heavy periods without underlying stagnation.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Contraindicated during pregnancy. Ru Xiang powerfully invigorates Blood and moves Qi, which can stimulate uterine activity and potentially cause miscarriage or premature labor. Classical sources are unanimous in stating 孕妇忌服 (prohibited for pregnant women). It is listed among the 'use with caution' (慎用) pregnancy herbs in standard Chinese materia medica references, though many practitioners treat it as a stronger prohibition. Note: The Ben Cao Gang Mu does record a historical use of Ru Xiang combined with Zhi Ke (Citrus aurantium) to facilitate difficult labor by making the fetus 'slippery,' but this was a specific application under direct supervision for obstructed delivery, not a general indication. It should never be used during normal pregnancy.

Breastfeeding

Use with caution during breastfeeding. There is no specific classical prohibition for breastfeeding, but as a Blood-moving herb with 'slightly toxic' classification, Ru Xiang's active compounds (boswellic acids, volatile oils) could theoretically transfer into breast milk. Its gastrointestinal irritant effects are a concern for the nursing infant. It should only be used during lactation under professional guidance and at the lowest effective dose.

Children

Ru Xiang should be used with caution in children. Its gastrointestinal irritant properties make it poorly tolerated in young children, and it is classified as slightly toxic. For children over 6 years old, dosages should be reduced to approximately one-third to one-half of the adult dose. It is generally not recommended for infants and toddlers. The processed form (vinegar-fried Ru Xiang) is preferred to reduce stomach irritation. External use as a powder or in plasters is generally better tolerated in pediatric cases of trauma or sores.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Ru Xiang

Anticoagulant and antiplatelet medications (warfarin, heparin, aspirin, etc.): Boswellic acids, the primary active compounds in Ru Xiang, have demonstrated antiplatelet and mild anticoagulant activity. In vitro research shows frankincense resin inhibits COX-1, which can affect platelet aggregation. Case reports from the Italian pharmacovigilance system have documented INR elevations in warfarin-treated patients taking Boswellia-containing products. These interactions are considered plausible but not yet confirmed by controlled clinical trials. Concurrent use should be closely monitored.

Drugs metabolised by CYP450 enzymes: In vitro studies have identified frankincense extracts (from multiple Boswellia species including B. carterii/B. sacra) as inhibitors of several major CYP450 enzymes, including CYP1A2, CYP2C8, CYP2C9, CYP2C19, CYP2D6, and CYP3A4. Inhibition of these enzymes could theoretically increase blood levels of many common medications metabolised through these pathways. The clinical significance of this interaction in humans remains uncertain, as hepatocyte-based models showed weaker inhibition than microsomal studies, but caution is warranted.

NSAIDs: Since Ru Xiang and NSAIDs target overlapping inflammatory pathways (5-lipoxygenase and COX), concurrent use could theoretically increase gastrointestinal irritation and bleeding risk. No formal clinical studies have evaluated this combination.

Immunosuppressants: Boswellic acids have immunomodulatory properties that could theoretically interfere with immunosuppressive medications (e.g. after organ transplantation). Avoid concurrent use without physician guidance.

Dietary Advice

Foods and dietary considerations when taking Ru Xiang

When taking Ru Xiang internally, avoid cold and raw foods, which can obstruct Qi movement and counteract the herb's Blood-invigorating effect. Alcohol in small amounts can enhance the herb's dispersing action (wine was traditionally used as a preparation medium), but excessive alcohol should be avoided due to additive stomach irritation. Rich, greasy, or difficult-to-digest foods should be minimized to reduce the burden on an already sensitive stomach.

Botanical Description

Physical characteristics and morphology of the Ru Xiang source plant

Ru Xiang (乳香) is the dried resin obtained from Boswellia carterii Birdw. (also classified as Boswellia sacra Flück.) and Boswellia bhaw-dajiana Birdw., small deciduous trees in the Burseraceae (frankincense) family. The trees grow 2 to 8 metres tall, often with one or more stout trunks covered in papery, pale brownish-yellow bark that peels in flakes. The leaves are compound and pinnate, with 7 to 10 pairs of opposite leaflets that are oval-shaped with rounded or slightly toothed margins. Small yellowish-white flowers with five petals and ten stamens grow in loose clusters.

These trees thrive in some of the harshest environments on earth: bare limestone cliffs, rocky escarpments, and arid ravines at elevations up to 1,200 metres, mostly in calcareous (chalite-rich) soil. They are native to the Horn of Africa (Somalia, Ethiopia) and the southern Arabian Peninsula (Oman, Yemen). When the bark is scored with a knife, a milky white resin oozes out, gradually hardening into the tear-shaped, yellowish-white lumps known as frankincense. Trees begin producing harvestable resin at about 8 to 10 years of age.

Sourcing & Harvesting

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

Harvesting season

Spring and summer, with spring being the peak harvesting season. The bark is scored from bottom to top, and the resin is collected after it flows into channels and hardens over several days.

Primary growing regions

Ru Xiang is not cultivated in China but is imported from Africa and the Arabian Peninsula. The two main types recognized in Chinese medicine are: 1. Somali frankincense (索马里乳香): Primarily from Somalia and the Somalia-Ethiopia border region. This accounts for the majority of global production and is considered the standard commercial grade. 2. Ethiopian frankincense (埃塞俄比亚乳香): From Ethiopia and Eritrea. The finest quality frankincense (known as "Hojari" grade) comes from the Dhofar region of Oman, prized for its clarity and citrus-pine aroma. The trees also grow in Yemen and across the Red Sea coast. Since Ru Xiang is entirely imported, the Chinese concept of 道地药材 (terroir) does not apply in the usual sense, but Somali-origin material has been the traditional standard in Chinese pharmacies.

Quality indicators

High-quality Ru Xiang (frankincense) appears as tear-drop shaped or rounded granules (called 'frankincense pearls,' 乳香珠) up to about 2cm in size, or as irregular lumps (called 'raw frankincense,' 原乳香) up to 5cm. The surface should be yellowish-white with a dusting of pale powder, and the pieces should be semi-translucent. The texture is brittle at room temperature but softens with heat. When broken, the fracture surface displays a glassy or waxy luster. The most important quality indicators are the distinctive aromatic fragrance (a characteristic balsamic, slightly lemony scent) and a mildly bitter taste. Pieces that are more translucent and uniformly colored are generally preferred. Darker coloration indicates age or improper storage. Resin that has fallen on the ground and collected sand or soil is considered lower grade. The 2015 Chinese Pharmacopoeia requires Somali frankincense to contain not less than 6.0% volatile oil, while Ethiopian frankincense must contain not less than 2.0%.

Classical Texts

Key passages from the classical Chinese medical texts that describe Ru Xiang and its therapeutic uses

《名医别录》(Supplementary Records of Famous Physicians)

Original: 乳香，微温。

Translation: "Ru Xiang is slightly warm in nature." This is among the earliest recorded descriptions of its thermal nature.

《本草纲目》(Ben Cao Gang Mu) by Li Shizhen

Original: 乳香香窜，入心经，活血定痛，故为痈疽疮疡、心腹痛要药。

Translation: "Ru Xiang is aromatic and penetrating, entering the Heart channel. It invigorates Blood and settles pain, making it an essential medicine for abscesses, sores, ulcers, and pain in the chest and abdomen."

《本草汇言》(Ben Cao Hui Yan)

Original: 乳香，活血去风，舒筋止痛之药也。……咸取其香辛走散，散血排脓，通气化滞为专功也。

Translation: "Ru Xiang is a medicinal for invigorating Blood, dispelling Wind, relaxing sinews, and stopping pain... Its special strength lies in its aromatic, acrid, and dispersing nature, which scatters Blood, expels pus, frees the movement of Qi, and transforms stagnation."

《医学衷中参西录》(Records of Medicine Integrating Chinese and Western) by Zhang Xichun

Original: 乳香、没药，二药并用，为宣通脏腑、流通经络之要药，故凡心胃胁腹肢体关节诸疼痛皆能治之。

Translation: "Ru Xiang and Mo Yao [myrrh], used together, are essential medicines for opening up the organs and freeing the channels. They can therefore treat all manner of pain in the chest, stomach, flanks, abdomen, limbs, and joints."

Historical Context

The history and evolution of Ru Xiang's use in Chinese medicine over the centuries

Ru Xiang (乳香) literally means "breast-milk incense" or "milky fragrance," named for the milky white resin that drips from the tree trunk when cut, resembling drops of milk. Its older name, Xun Lu Xiang (熏陆香), appears in the Ming Yi Bie Lu (Supplementary Records of Famous Physicians, circa 3rd-4th century CE), indicating it was already known in China during the Wei-Jin period, arriving via the maritime and overland Silk Road trade routes.

Frankincense has an extraordinarily long cross-cultural history. Ancient Egyptians used it over 3,500 years ago, and it was one of the three gifts brought to the infant Jesus according to the Gospel of Matthew. In the Arabian and African traditions, it was used for wound healing, religious ceremonies, and treating fevers and digestive ailments. In Chinese medicine, it became one of the most important imported (舶来) medicinal substances, consistently paired with Mo Yao (myrrh, from Commiphora species) as a complementary duo. The great integrationist physician Zhang Xichun (张锡纯, late Qing to Republican era) championed their combined use in his famous formula Huo Luo Xiao Ling Dan (活络效灵丹), praising the pair as essential medicines for freeing the organs and channels. Li Shizhen in the Ben Cao Gang Mu noted that the pairing of Ru Xiang and Mo Yao was so common that prescriptions simply wrote "Ru Mo" (乳没) as shorthand for both herbs together.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Ru Xiang

1

Frankincense: Systematic Review of Randomised Clinical Trials (2008)

Ernst E. BMJ. 2008;337:a2813.

This systematic review assessed seven randomized clinical trials of Boswellia serrata extracts for conditions including asthma, rheumatoid arthritis, Crohn's disease, osteoarthritis, and collagenous colitis. All included trials reported positive clinical outcomes, and no serious safety concerns were noted. However, the author concluded that while the evidence was encouraging, it was not yet compelling due to methodological limitations in several trials.

2

Boswellia serrata: An Overall Assessment of In Vitro, Preclinical, Pharmacokinetic and Clinical Data (Review, 2011)

Abdel-Tawab M, Werz O, Schubert-Zsilavecz M. Clinical Pharmacokinetics. 2011;50(6):349-369.

A comprehensive pharmacological review covering the in vitro activities, animal studies, pharmacokinetics, and clinical trial data for Boswellia serrata. The review found that boswellic acids (especially AKBA and KBA) are potent inhibitors of 5-lipoxygenase, reducing pro-inflammatory leukotriene synthesis. Clinical data supported benefits in osteoarthritis and inflammatory bowel disease, though oral bioavailability of boswellic acids was noted to be low.

3

Anti-inflammatory and Anti-cancer Activities of Frankincense: Targets, Treatments and Toxicities (Systematic Review, 2020)

Efferth T, Oesch F. Seminars in Cancer Biology. 2022;80:39-57.

A systematic review covering the anti-inflammatory and anti-cancer mechanisms of Boswellia species and their chemical constituents. The review found that frankincense acts through multiple pathways including inhibition of 5-lipoxygenase, COX-1/2, and NF-kB signaling. Clinical trials demonstrated efficacy against osteoarthritis, asthma, psoriasis, and gingivitis. Anti-cancer effects through cell cycle arrest and apoptosis induction were observed in preclinical models.

4

Analysis of Frankincense from Various Boswellia Species with Inhibitory Activity on Human Drug Metabolising Cytochrome P450 Enzymes (In Vitro, 2006)

Frank A, Unger M. Journal of Chromatography A. 2006;1112(1-2):255-262.

This in vitro study tested frankincense extracts from four Boswellia species and found that all were equally potent, non-selective inhibitors of major drug-metabolising CYP enzymes (CYP 1A2, 2C8, 2C9, 2C19, 2D6, and 3A4). While individual boswellic acids showed moderate-to-potent CYP inhibition, the study concluded they were not the primary CYP-inhibitory components in the whole resin, suggesting other compounds also contribute.

PubMed

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.