Traditionally used for
- Cough & breathing
- Digestion
- Bowel health
- Urinary & fluids
- Menstrual & women's health
- Skin
☯ TCM Properties
Clears Damp-Heat and cools the Blood; Promotes urination; Disperses abscesses
Traditional Chinese Uses
Mu Jin Hua, the dried flower of Hibiscus syriacus (Flos Hibisci), is a cold, sweet-and-bland herb in the heat-clearing category, entering the Lung and Spleen channels. It clears Damp-Heat and cools the Blood, and is used chiefly for damp-heat patterns of the lower burner: dysentery and diarrhea, and thick, yellow, foul-smelling vaginal discharge (leukorrhea). Its Blood-cooling action also addresses bleeding hemorrhoids and blood in the stool.
Applied externally, the flower is used on furuncles, sores and swellings. It is typically decocted at 3-9 g, or dried and powdered. Related parts of the same shrub, notably the bark (Mu Jin Pi), share the damp-heat-clearing action. Being cool and draining, it suits excess-Heat patterns rather than deficiency-cold conditions of the digestive tract.
Relationships
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Botanical Description
Hibiscus syriacus, the rose of Sharon, is a deciduous shrub of the Malvaceae family native to East Asia (despite its specific epithet) and widely cultivated as an ornamental across temperate regions. The plant grows two to four meters tall with an upright vase-shaped habit, freely branching from the base, and bears greyish-brown bark that becomes longitudinally fissured with age. Leaves are alternate, broadly ovate to rhomboid, three-lobed with coarsely toothed margins, dark green above and paler beneath, and unfold relatively late in spring. The plant flowers profusely from mid-summer to early autumn, producing solitary trumpet-shaped flowers up to ten centimeters across in the upper leaf axils; colors range from pure white through pink, lavender, and violet to deep blue-purple, often with a contrasting darker basal blotch and a prominent staminal column.
Active Constituents
Saponarin (apigenin 6-C-glucoside 7-O-glucoside)
Flavone C,O-diglycosideThe compound identified as the active constituent of Hibiscus syriacus flower extract in the sedative work, where isolated saponarin reproduced the extract's effects on sleep architecture in mice. It is also the constituent most often named as the principal flavonoid of the flower and was among the bioactives detected across plant parts by the nutritional profiling study.
Schaftoside and isoschaftoside
Flavone di-C-glycosideApigenin di-C-glycosides detected as main bioactive compounds across the plant parts of H. syriacus. Because both sugars are C-linked they are not cleaved by gut glycosidases, so they reach the circulation intact but with low bioavailability.
Anthocyanins (predominantly cyanidin and delphinidin glycosides, including malonylated forms)
Anthocyanin (flavonoid pigment)The pigments of the petal. Quantitative work across cultivars found cyanidin derivatives to be the largest group, with delphinidin 3-O-glucoside and the malonylated cyanidin and delphinidin glucosides among the most abundant, and the aglycone set covering cyanidin, delphinidin, malvidin, petunidin, peonidin and pelargonidin. An anthocyanin fraction isolated from this species attenuated lipopolysaccharide-induced inflammation and endotoxic shock in mice by blocking TLR4/MD2-mediated NF-kappa-B signalling. Cultivar and flower colour change the anthocyanin content substantially, so purple-flowered and white-flowered material are not chemically interchangeable.
Kaempferol 3-O-galactoside-7-O-rhamnoside
Flavonol diglycosideListed among the main bioactive compounds detected in H. syriacus. The petals carried the largest number of identified compounds of any plant part, two phenolic acids and twenty-two flavonoids, and had the highest antioxidant activity.
o-Coumaric acid and p-coumaric acid
Hydroxycinnamic (phenolic) acidThe two phenolic acids identified among the main bioactive compounds of the plant. They are minor relative to the flavonoid load but contribute to the total antioxidant capacity of the petal.
Luteolin 7-O-glucoside
Flavone glycosideOne of the flavonoids reported from H. syriacus petals in flavonoid profiling work, alongside apigenin C-diglucoside, apigenin 7-O-rutinoside, vitexin and malonylated kaempferol and luteolin glycosides. Total flavonoid content was the main determinant of the antioxidant activity of the flower.
Betulin
Lupane triterpeneReported from H. syriacus, but from the stem and root bark rather than the flower. Mu Jin Hua is the flower; Mu Jin Pi, the bark, is a separate drug used as an antifungal wash, and constituents such as betulin, canthin-6-one, nonanoic acid and the syriacusin naphthalenes belong to it and should not be attributed to the flower.
⚠ Drug Interactions
Benzodiazepines, Z-drugs, barbiturates and other CNS depressants
Hibiscus syriacus flower extract and its constituent saponarin lengthened sleep maintenance in the pentobarbital-induced sleep model in mice, the standard screen for potentiation of barbiturate and benzodiazepine-type hypnosis, and also restored sleep duration in foot-shock and restraint stress models. The extract is being developed as a sleep functional food and a placebo-controlled trial in eighty people with sleep disturbance dosing four capsules before bed for four weeks has been registered and its protocol published, so human exposure at deliberate sedative doses is now realistic. Results of that trial have not appeared, so the size of the effect in people is unknown.
Clinical note: Ask about Mu Jin Hua and about hibiscus sleep supplements before adding a hypnotic, warn about driving if both are taken, and separate the herb from an evening benzodiazepine rather than stacking them.
Hibiscus sabdariffa (roselle) interaction data misapplied to this herb
The published human interaction work on hibiscus, including effects on the bioavailability of coadministered drugs and on blood pressure, was done with Hibiscus sabdariffa calyces. Hibiscus syriacus flower is a different species with a different constituent profile, dominated by saponarin and C-glycosylflavones rather than roselle's hibiscus acid and delphinidin sambubiosides, and has no interaction dataset of its own.
Clinical note: Confirm the binomial before applying any hibiscus interaction warning, and note that many consumer sleep and tea products labelled hibiscus are roselle, not this species.
Hibiscus syriacus bark or root (Mu Jin Pi, Mu Jin Gen) dispensed for the flower
Hibiscus syriacus yields three distinct drugs in Chinese practice, the flower, the bark and the root bark, and their chemistry differs: saponarin, anthocyanins and flavonoid glycosides characterise the flower, while betulin, canthin-6-one, nonanoic acid and the syriacusin naphthalenes are described from the bark and root. Much of the antifungal literature attributed loosely to Hibiscus syriacus is bark work.
Clinical note: Specify Flos rather than Cortex on the prescription, and read any Hibiscus syriacus study for which plant part was actually extracted before applying it to this drug.
Evidence Tier
Moderate evidence · 3 studiesRecorded studies by study design, strongest design at the top. This is a study-design tier only, not a GRADE rating: it does not weigh risk of bias, consistency or precision.
Systematic review / meta-analysis
0
Randomized controlled trial
0
Other clinical trial
0
Observational / case report
0
In vitro / animal
3
1 verified · 2 unverified
Show 3 studies
- Effect of Hibiscus syriacus Linnaeus extract and its active constituent, saponarin, in animal models of stress-induced sleep disturbances and pentobarbital-induced sleep
- Anthocyanins isolated from Hibiscus syriacus L. attenuate lipopolysaccharide-induced inflammation and endotoxic shock by inhibiting the TLR4/MD2-mediated NF-κB signaling pathway
- Polyphenols from the flower of Hibiscus syriacus Linn ameliorate neuroinflammation in LPS-treated SH-SY5Y cell
Other / unclassified
0
Verified: design read from PubMed for a DOI that resolves to the cited paper Unverified: taken from the study's recorded description
Clinical Studies
Effect of Hibiscus syriacus Linnaeus extract and its active constituent, saponarin, in animal models of stress-induced sleep disturbances and pentobarbital-induced sleep
Hibiscus syriacus flower extract and isolated saponarin increased REM sleep time in an electric foot-shock model of sleep disturbance, restored sleep duration in a restraint stress model, and increased sleep maintenance time in the pentobarbital-induced sleep model, with an accompanying anxiolytic effect. This is the study underpinning the herb's development as a sleep aid, and it is also the direct basis for expecting additive sedation with hypnotic drugs.
Anthocyanins isolated from Hibiscus syriacus L. attenuate lipopolysaccharide-induced inflammation and endotoxic shock by inhibiting the TLR4/MD2-mediated NF-κB signaling pathway
An anthocyanin fraction from H. syriacus reduced lipopolysaccharide-driven inflammatory signalling and protected against endotoxic shock, with the authors locating the effect at the TLR4/MD2 receptor complex upstream of NF-kappa-B. It provides a defined mechanism for the flower's traditional damp-heat and toxin-clearing indications, at preclinical level only.
Polyphenols from the flower of Hibiscus syriacus Linn ameliorate neuroinflammation in LPS-treated SH-SY5Y cell
A polyphenol fraction prepared specifically from the flower reduced lipopolysaccharide-induced inflammatory injury in SH-SY5Y neuroblastoma cells. A cell-culture result on the correct plant part, but with no animal or human follow-up and no bearing on any classical indication of Mu Jin Hua.
Historical Texts
Ri Hua Zi Ben Cao
Song dynasty, 10th centuryBen Cao Gang Mu
Ming dynasty, 1596 CEReferences
- Park Y, Kwon SH, Jang YL, Lee DH, Yang SO, Eo HJ, Park GH, Kwon HY. Nutritional composition and phytochemical screening in different parts of Hibiscus syriacus L. . Food Science & Nutrition (2022) [DOI]
- Zhang P, Li Y, Chong S, Yan S, Yu R, Chen R, Si J, Zhang X. Identification and quantitative analysis of anthocyanins composition and their stability from different strains of Hibiscus syriacus L. flowers . Industrial Crops and Products (2022) [DOI]
- Choi Y, Park YH, Yang C, Kim DH, Lee KW, Lee MY. Protocol for a randomized controlled trial evaluating the effect of Hibiscus syriacus L. flower extract on sleep quality . Frontiers in Nutrition (2023) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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