Mu Dan Pi â Shrub Peony Root Bark
Mu Dan Pi is the root bark of the tree peony (Paeonia suffruticosa) and is one of the most important blood-purifying herbs in Chinese medicine. Its main active ingredient, paeonol, gives it a pronounced cooling and anti-inflammatory effect that addresses both heat in the blood and latent yin deficiency heat.
In traditional herbal medicine, it is used primarily for womenâfor menstrual disorders caused by blood stasis or blood heat, for inner restlessness and night sweats, and for inflammatory skin rashes. It cools without drying out the body too much and promotes blood circulation without depleting it.
Effect from a Western perspective
Paeonol, the main active ingredient in Mu Dan Pi, has been extensively studied and exhibits a broad spectrum of pharmacological effects. Its anti-inflammatory, antioxidant, and anticoagulant properties have been particularly well documented, supporting the traditional TCM indications at the molecular level.
- Paeonol inhibits platelet aggregation and improves microcirculation - Anti-inflammatory effects via inhibition of the COXâ2 and NFâÎșB signaling pathways - Antioxidant effects protect endothelial cells from oxidative stress - Hepatoprotective properties demonstrated in cases of toxic liver damage - Neuroprotective effects observed in animal models of cerebral ischemiaEffect from a TCM perspective
Mu Dan Pi cools the blood and resolves blood stasis without causing excessive dryness. It clears rising liver fire and dispels hidden heat from the Yin realm. It is traditionally used to treat Yin-deficiency heat accompanied by night sweats and bone fever.
- Cools blood heat and stops bleeding caused by heat in the Xue region
- Stimulates blood circulation and resolves blood stasis, especially in the lower abdomen
- Dispels hidden heat (GÇ ZhÄng) in cases of yin deficiency with bone fever
- Clears rising liver fire associated with headaches and red eyes
- Reduces swelling and promotes the healing of abscesses
Application & dosage
- Decoction: 6â12 g; use raw for blood heat, and lightly roasted for blood stasis.
- Granules: 2â4 g daily, dissolved in warm water.
- Tablets: 3â4 tablets of 500 mg each, 2â3 times a day.
- Powder: 1.5â3 g daily, stirred into warm water or honey.
Dosage forms
- Decoction
- Granules
- Tablets
- Powder
Dosage
6â12 g (decoction)
Frequent combination partners
Mu Dan Pi often does not reach its full effectiveness until it is combined with other herbs
Combinations & formulas
- With Sheng Di Huang and Chi Shao For "blood-heat" conditions accompanied by bleeding or skin rashesâthis combination both cools and invigorates the blood at the same time.
- With Zhi Zi and Chai Hu for rising liver fire accompanied by headache, irritability, and red eyes.
- With Gui Zhi For blood stasis in the lower abdomenâthe classic combination of GuĂŹ ZhÄ« FĂș LĂng WĂĄn, one of the most important gynecological formulas.
- With Sheng Di Huang and Zhi Mu For Yin-deficiency heat with bone chills and night sweats (QÄ«ng HÄo BiÄ JiÇ TÄng).
History & Tradition
Mu Dan Pi is already mentioned in the *ShĂ©n NĂłng BÄn CÇo JÄ«ng*, the oldest Chinese pharmacopoeia, as a medium-grade remedy. In imperial China, the tree peony (MÇ DÄn) was considered the âKing of Flowersâ and symbolized wealth, honor, and beauty.
During the Tang Dynasty, peony cultivation reached its peakâgardens featuring hundreds of varieties were created in Luoyang. However, the medicinal use of the root bark dates back much further: as early as the Han Dynasty, it was used to cool the blood.
ZhÄng ZhĂČngjÇng used Mu Dan Pi in several formulas, including the famous GuĂŹ ZhÄ« FĂș LĂng WĂĄn and the LiĂč WĂši DĂŹ HuĂĄng WĂĄn family. These formulas remain indispensable in clinical practice to this day.
Contraindications & caution
Do not use in cases of heavy menstrual bleeding or pregnancyâthe blood-moving effect may increase blood flow and endanger the fetus. Mu Dan Pi is not indicated for blood deficiency without signs of heat, as its cooling nature may exacerbate the deficiency. Use with caution in cases of spleen qi deficiency with diarrheaâits cooling and bitter-drying properties may further impair digestion.
Botany
The tree peony (Paeonia suffruticosa (Andr.) is a deciduous shrub in the Paeoniaceae family that grows to a height of 1â2 m. The plant has woody stems with large, bipinnate leaves and spectacular flowers in white, pink, red, or purple.
The root bark (cortex) is used as a medicinal herbâit is reddish-brown, has a characteristic aromatic odor, and a bitter, slightly pungent taste. When dried, it develops a distinctive aroma due to its paeonol content.
- Found in the temperate mountainous regions of central China, particularly in ÄnhuÄ«, ShÄndĆng, and SĂŹchuÄn - The main growing region is around TĂłnglĂng in ÄnhuÄ«, where the highest-quality variety (FĂšng DÄn PĂ) is produced - Prefers well-drained, humus-rich soils in partially shaded to sunny locations - Grows at elevations between 500 and 2,000 meters above sea levelOccurrence
Central China, particularly ÄnhuÄ« (TĂłnglĂng), ShÄndĆng, and SĂŹchuÄn; mountainous regions at elevations between 500 and 2,000 meters
Harvest time
Fall, 3â5-year-old roots
Processing
The roots of 3â5-year-old plants are dug up in the fall, cleaned of soil, and peeled. They are then sliced and air-dried. For raw use (to cool blood heat), the bark remains untreated. To activate its blood-invigorating effect, it is lightly roasted (chao), which moderates its cooling nature and enhances its effect on blood stasis. Charred Mu Dan Pi (tan) is occasionally used to stop bleeding.
Related herbs
Herbs with similar effects and related areas of application
Comparable western herbs
Meadowsweet (Filipendula ulmaria) â anti-inflammatory and antipyretic due to natural salicylates; its antithrombotic effect is comparable to that of paeonol. Traditionally used for fever, pain, and inflammation.
Stinging nettle (Urtica dioica) â blood-purifying and anti-inflammatory; traditionally used in European folk medicine for skin conditions attributed to âimpure bloodââa parallel to the TCM indication of âblood heat.â.
Calendula (Calendula officinalis) â promotes the healing of inflammation, abscesses, and wounds; its anti-inflammatory and antimicrobial properties are comparable to the wound-healing effects of Mu Dan Pi on abscesses and boils.
Bloodroot (Potentilla erecta) â astringent and hemostatic in cases of mucosal inflammation; similar indications for bleeding associated with inflammation, such as the hemostatic effect of Mu Dan Pi in cases of heat in the Xue system.