Lophatherum leaf

Lophatherum Leaf (Lophatherum gracile Brongn.): A Comprehensive Reference

1. Identity and Botanical Description

1.1 Taxonomy and Nomenclature

Lophatherum gracile Brongn. is a perennial herb belonging to the family Gramineae (Poaceae), sometimes also written Lophatherum gracile Bronghiart in more recent literature. The plant is generally found in southern China. The dried medicinal material derived from its stems and leaves carries the Latin pharmacopeial name Lophatheri Herba, and in Mandarin Chinese is known as Dàn Zhú Yè (淡竹叶), meaning "bland bamboo leaf." It is also referred to in Latin as Herba Lophatheri Gracilis.

Despite its resemblance to bamboo leaves, lophatherum is not true bamboo; rather, it is a leafy grass harvested for its medicinal foliage. It has a short, thick rhizome with sparse fibrous roots that often enlarge into distinctive spindle-shaped (fusiform) tuberous swellings near their tips. The stems are slender, cylindrical, hollow, and slightly woody, with visible nodes. The leaves are lance-shaped (lanceolate), 5 to 20 cm long and 1 to 3.5 cm wide, with a bright green color, parallel veins, and characteristic small transverse veinlets that form a rectangular lattice pattern clearly visible on the lower leaf surface.

The plant is cultivated in Zhejiang, Jiangsu, Hunan, and Hubei Provinces in China. The leaf of L. gracile has been officially listed in the Chinese Pharmacopoeia as a crude drug.

1.2 Common Forms and Preparations

Lophatheri Herba (Danzhuye in Chinese) is derived from the dried stems and leaves of Lophatherum gracile. In traditional and clinical settings, it is also usually consumed as herbal teas or in soup cooking with other edible plants in China. The herb is available in several physical forms: whole dried herb cut into decoction pieces for traditional water decoction; water-extracted concentrated granules; capsule and tablet forms derived from concentrated extracts; and it is also used in the cosmetic industry and as a natural additive in the functional food industry. L. gracile has also been popularly consumed as a dietary supplement and is an important natural additive in the "Wong Lo Kat herbal tea."

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2. Traditional and Historical Use

2.1 Chinese Medical History and Classical Texts

Dan Zhu Ye as a distinct medicinal substance was first formally described in Li Shizhen's Ben Cao Gang Mu (本草纲目, 1596). Before this, the name "Zhu Ye" (竹叶, bamboo leaf) in classical formulas referred to the fresh leaves of true bamboo species (such as Phyllostachys nigra var. henonis). Li Shizhen was the first to clearly distinguish the grass Dan Zhu Ye (Lophatherum gracile) as a separate entry from true bamboo leaves.

This herb has been reported in Ben Cao Gang Mu [Herbal Foundation Compendium published in Nanjing (China) in 1596] and exhibits several pharmacological activities, including diuretic effects as well as soothing heart stress, mouth sores, and restlessness. Dan-Zhu-Ye was recorded in the Compendium of Materia Medica and has been used to treat hydrodipsia, fever, and urinary tract inflammation for thousands of years in China.

2.2 TCM Classification and Therapeutic Functions

In TCM, Dàn Zhú Yè is classified as a heat-clearing herb, often prescribed to treat irritability, thirst, mouth ulcers, urinary tract infections, and restlessness due to heat — especially when heat has entered the Heart or Small Intestine meridians. It is well recognized in TCM for its effects of "clearing heat and reducing fire, relieving restlessness and thirst, as well as enhancing diuresis and catharsis."

In traditional Chinese texts, the herb has the ascribed efficacy of eliminating dysphoria by cooling and promoting fluid production to induce diuresis, with a sweet and mild taste, a cold quality, and affinity for the heart and kidney meridians. As listed in the Chinese Pharmacopoeia, L. gracile has various pharmacological effects, including clearing heat fire, promoting diuresis, relieving stranguries, and alleviating heart stress, mouth sores, and restlessness.

The historical distinction between Zhu Ye and Dan Zhu Ye remains clinically important: fresh bamboo leaf (Zhu Ye) is better at clearing Heart Heat and cooling the Stomach, while Dan Zhu Ye is stronger in promoting urination and draining Damp-Heat downward.

2.3 Traditional Indications and Conditions Treated

The leaves of this plant were widely used in the treatment of pyreticosis, hydrodipsia, ardor urinae, and urinary tract inflammation in traditional Chinese medicine. Classical indications include heat diseases with fever, thirst, irritability, and insomnia; summer heat and heatstroke; chronic, lingering, or residual fever following febrile disease; mouth and gum sores, ulcers, pain and swelling; and painful, scanty, or dribbling urine, including hematuria.

The herb is also an important ingredient of traditional Chinese prescriptions such as "Health Star (Granules)," which is a commonly used pediatric medication in southern China to clear heat and detoxify. It appears as a component in several classical multi-herb formulas, including Zhu Ye Shi Gao Tang (Lophatherum and Gypsum Decoction) for clearing heat from the Qi level, and Dao Chi San (Guide Out the Red Powder) for addressing heart fire with urinary discomfort. In San Ren Tang (Three-Seed Decoction) from the Wen Bing Tiao Bian, Dan Zhu Ye assists the three seed herbs in clearing Damp-Heat from the Lower Burner via urination.

Lophatherum leaf is both a traditional medicine and an edible plant. It has been a crucial component in traditional medicinal practices throughout Asia and has been listed in the Chinese Pharmacopoeia.

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3. Phytochemistry: Key Constituents and Active Compounds

3.1 Flavonoids — Primary Active Class

Flavonoids and phenolic acids are the main active ingredients in Lophatheri Herba, which produce diuretic, anti-inflammatory, and antipyretic effects. Flavonoid glycosides and hydroxybenzoic acids are respectively the main structure in 44 flavonoids and 16 phenolic acids obtained from Lophatheri Herba.

L. gracile leaf (LGB) is abundant in flavonoids, polyphenols, and coumarin lactones, making it a significant source of natural antioxidants. A series of potent antioxidant flavones have been isolated from L. gracile that have been identified as isoorientin, orientin, swertiajaponin, vitexin, and luteolin-7-O-β-D-glucoside.

A comprehensive phytochemical study identified the following compounds from the leaves: salcolin A, salcolin B, tricin, luteolin, afzelin, tricin 7-O-β-D-glucopyranoside, swertiajaponin, isoorientin, tricin 7-O-neohesperidoside, vitexin, isovitexin, β-(p-methoxyphenyl) acrylic acid, β-sitosterol, and daucosterol. A further HPLC-based study quantified: orientin, isoorientin, vitexin, isovitexin, kaempferol, luteolin, caffeic acid, and chlorogenic acid as characteristic components, noting that chlorogenic acid, kaempferol, isovitexin, luteolin, and isoorientin vary by geographic origin.

Isoorientin, orientin, rutin, vitexin, isovitexin, quercetin, and luteolin are considered the main pharmacologically active ingredients as verified by UPLC fingerprint or LC-MS/MS analysis. Among the flavonoids, the proportion of luteolin content in the ethyl acetate extract is 3.43%, followed by 0.285% of quercetin.

3.2 Triterpenoids, Sterols, and Other Constituents

The stems and leaves of Lophatherum gracile Brongn. mainly contain triterpenoids and sterols, which are identified as arundoin, cylindrin, taraxerol, friedelin, β-sitosterol, stigmasterol, campesterol, and taraxasterol, while their aerial parts contain phenols, amino acids, organic acids, and saccharides. Additional compounds identified by Q. Chen included 4-hydroxy-3,5-dimethoxybenzaldehyde, trans-p-hydroxy cinnamic acid, tricin, tricin-7-O-β-D-glucosyl, vitexin, thymine, vanillic acid, and adenine.

3.3 Polysaccharides

A water-soluble polysaccharide (LGP) has been isolated and structurally characterized from L. gracile. LGP has a molecular weight of 1.42 × 10⁶ Da and is mainly composed of arabinose (Ara), galactose (Gal), xylose (Xyl), and other monosaccharides. NMR spectra suggest that LGP may be composed of 1,3-β-Galp and 1,3,6-β-Galp main chains, and a side chain formed by a 1,5-α-Araf short chain. The termini are composed of T-α-Araf, while [→4)-α-GalpA-(1→2)-α-Rhap-(1→] are attached to the backbone as short side chains.

3.4 Summary of Constituent Classes

• C-glycosyl flavonoids: isoorientin, orientin, vitexin, isovitexin, swertiajaponin
• Flavone aglycones: luteolin, apigenin, tricin, kaempferol, quercetin
• Flavonoid O-glycosides: luteolin-7-O-β-D-glucoside, tricin 7-O-β-D-glucopyranoside, afzelin, rutin
• Phenolic acids: chlorogenic acid, caffeic acid, vanillic acid, trans-p-hydroxycinnamic acid
• Triterpenoids: arundoin, cylindrin, taraxerol, friedelin, taraxasterol
• Sterols: β-sitosterol, stigmasterol, campesterol, daucosterol
• Polysaccharides: arabinogalactan-type water-soluble polysaccharide (LGP)
• Other: coumarin lactones, amino acids, organic acids

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4. Established and Proposed Mechanisms of Action

4.1 Anti-inflammatory Pathways

Modern pharmacological research indicates that flavonoids are the primary active constituents found in LGB, demonstrating properties such as antioxidative, anti-inflammatory, and hypoglycemic effects. In studies on neutrophil-mediated inflammation, the petroleum ether and ethyl acetate extract of L. gracile has been shown to activate PPARα, which suggests potential anti-inflammatory activity.

Research published in the Journal of Ethnopharmacology (2021) examined the herb's effects on neutrophilic inflammation. A water extract of the leaves (WELG) inhibits osteoclastogenesis by suppressing both receptor activator of nuclear factor-κB ligand (RANKL)-induced early activation of mitogen-activated protein kinases (MAPKs) and nuclear factor-κB (NF-κB)- and RANKL-induced modulation of the positive and negative regulators of osteoclastogenesis in osteoclast precursors.

4.2 Antioxidant Mechanisms

Ethanol extracts from L. gracile leaves with a high amount of total flavonoids showed good antioxidant activities confirmed by DPPH and ABTS in vitro methodologies. One of the beneficial properties of flavonoids is protection against oxidative stress by direct scavenging of free radicals and inducing antioxidant enzymes.

4.3 Vasorelaxation

The ethanol extract of L. gracile showed vasorelaxant activity in isolated aortic tissue of rats. The mechanism of action is via an endothelial-dependent NO-cGMP signaling pathway, which is in part related to the function of K⁺ channels.

4.4 Hypoglycemic and Gut Microbiota Mechanisms

Three functional components — isoorientin, orientin, and isovitexin — were selected as key candidates responsible for anti-diabetic effects. In T2DM mice, LGB effectively improved glucose and lipid metabolic dysfunction. Untargeted metabolomics analysis revealed that LGB modulated pathways related to lipid and carbon metabolism. 16S rRNA gene sequencing and targeted metabolomics analysis revealed that LGB decreased the ratio of Firmicutes to Bacteroidetes and increased the abundance of bacterial groups such as Lactobacillales and Bacteroides. Additionally, LGB elevated the levels of SCFAs, specifically acetic and butyric acid. Moreover, LGB alleviated intestinal inflammation and upregulated the expression of tight junction proteins by inhibiting the LPS/TLR4/NF-κB signaling pathway. The hypoglycemic mechanism is linked to the "gut microbiota–SCFAs–inflammatory response" signaling axis.

A separate 2023 study in the Journal of Food Biochemistry on flavonoids from L. gracile in a high-fat diet/streptozotocin diabetic mouse model found that flavonoids from L. gracile have broad pharmacological activities such as anti-inflammatory and antioxidant effects. In that study, network pharmacology and molecular docking strategies were used to examine effects via the PI3K/AKT and NF-κB pathways, with pancreatic lipase inhibitory activity also demonstrated for a flavonoid-enriched fraction (LGBF).

4.5 Uric Acid-Lowering Mechanisms

A murine model of potassium oxonate and yeast-induced hyperuricemia (HUA) demonstrated that L. gracile significantly reduced serum uric acid and increased urine uric acid levels in HUA mice. L. gracile effectively inhibits the overproduction of uric acid by decreasing the activities of xanthine oxidase and adenosine deaminase (ADA), promoting excretion by regulating the mRNA expression of glucose transporter 9. Network pharmacology showed that the components of L. gracile acted on the targets xanthine dehydrogenase (XDH), adenosine deaminase (ADA), and solute carrier family 2 member 9 (SLC2A9).

4.6 Antiviral Mechanisms

Flavone C-glycosides of L. gracile were found to dominate both anti-inflammatory and antiviral effects. FlavoLG and isoorientin were shown to inhibit SARS-CoV-2 pseudovirus infection by interfering with the binding of the SARS-CoV-2 spike protein on ACE2.

4.7 Antibacterial Mechanisms

Most flavonoids in L. gracile have good antibacterial effects on E. coli standard and clinical multidrug-resistant (MDR) E. coli; the MIC and MBC of luteolin on the tested bacteria were 1.0 mg/mL and 2.0 mg/mL, respectively.

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5. Scientific Evidence by Area of Use

5.1 Anti-inflammatory and Antipyretic Activity

Evidence level: Primarily preclinical (in vitro and animal); no published human clinical trials identified specifically for isolated inflammation or fever outcomes.

Pharmacological research has demonstrated that the extract of leaves of L. gracile showed antipyretic, diuretic, antibacterial, antitumor, and hyperglycemic effects. Modern pharmacological studies have found that the main chemical constituents of Lophatheri Herba play important roles in anti-inflammatory, cardioprotective, hepatoprotective, and hypoglycaemic effects. Studies have demonstrated that flavonoid monomers — for example, luteolin, isoorientin, luteolin-7-O-β-D-glucoside, and apigenin — are more effective in exerting these pharmacological effects. The evidence base remains preclinical. No rigorous randomized controlled trials in humans examining lophatherum leaf as a sole antipyretic or anti-inflammatory agent were identified in the literature.

5.2 Antiviral Activity

Evidence level: In vitro and animal studies; no standalone human clinical trials identified for lophatherum leaf as an antiviral agent.

An ethanol extract of L. gracile (DZY) was shown to inhibit respiratory syncytial virus (RSV) infection and RSV-induced inflammation in vitro and in vivo. The study used RSV-infected HEp-2 and RAW264.7 cell models to assess inhibitory effects on RSV replication and nitric oxide production in vitro, alongside mouse models in vivo. These findings provide the rationale and scientific evidence behind the extensive use of L. gracile in traditional medicine for the treatment of diseases potentially caused by RSV.

Regarding SARS-CoV-2, a 2023 study published in Phytomedicine (PMC9812844) investigated the bioactive components responsible for anti-inflammatory and antiviral activity. Previous studies demonstrated that extracts of L. gracile attenuate inflammatory response and inhibit SARS-CoV-2 replication; however, the underlying active constituents had yet to be identified. Flavone C-glycosides of L. gracile were found to dominate both anti-inflammatory and antiviral effects. A simple chromatography-based method was developed to obtain a flavone C-glycoside-enriched extract (FlavoLG) from L. gracile. Most flavonoids have low oral bioavailability; therefore the in vivo anti-inflammatory effect and anti-SARS-CoV-2 infection activity require further study before clinical application. These studies are exclusively preclinical.

Isoorientin and other flavone C-glycosides of L. gracile also inhibit the respiratory syncytial virus. The broad antiviral spectrum of L. gracile extracts could greatly expand the applicability of this compound in the development of antiviral products.

5.3 Antibacterial Activity

Evidence level: In vitro only; no clinical studies identified.

A 2024 study in Frontiers in Pharmacology (PMC11232434) used a micro-broth dilution method to assess the antibacterial effects of flavonoids isolated from L. gracile against multidrug-resistant Escherichia coli. The proportion of luteolin content in the ethyl acetate extract was 3.43%, followed by 0.285% quercetin. Rutin content was only 0.268%. Orientin and isoorientin are isomers with a combined content of 0.144%. Vitexin and isovitexin had a combined content of 0.107%. Most flavonoids in L. gracile demonstrated good antibacterial effects on both standard and clinical MDR E. coli, with the MIC and MBC of luteolin being 1.0 mg/mL and 2.0 mg/mL, respectively. All evidence is currently confined to in vitro assays.

5.4 Antidiabetic / Hypoglycemic Activity

Evidence level: Animal (in vivo) studies and in vitro cell models; no human clinical trials identified specifically for lophatherum leaf.

A 2025 study published in Current Issues in Molecular Biology (PMC12468491) employed an integrative approach — HPLC fingerprinting, component-activity correlation, T2DM mouse models, and metabolomics — to characterize the anti-diabetic mechanism of L. gracile leaf extract (LGB). Six common characteristic peaks were identified from six batches of LGB, with 39 characteristic chemical components preliminarily identified. Through component-activity correlation analysis, three functional components — isoorientin, orientin, and isovitexin — were selected as key candidates. In T2DM mice, LGB effectively improved glucose and lipid metabolic dysfunction. Untargeted metabolomics analysis revealed that LGB modulated pathways related to lipid and carbon metabolism.

A 2023 study (Journal of Food Biochemistry, Wiley) studied the effect of flavonoids from L. gracile (LGBF) in a high-fat diet and streptozotocin-induced diabetic mouse model with a focus on liver damage and signaling via PI3K/AKT and NF-κB pathways. The study used network pharmacology and molecular docking to predict targets, then validated results in vivo. These results are preliminary and limited to animal and cell models.

A separate preclinical investigation using UA overproduction and excessive absorption cell models screened L. gracile for uric acid-lowering effects. The uric acid-lowering effect was discovered for the first time in L. gracile in that study. These findings suggested that L. gracile could be used as a potential strategy for the development of anti-hyperuricemia functional foods.

5.5 Hepatoprotective Activity

Evidence level: Animal studies and in vitro evidence; no human clinical trials identified.

A 2016 study published in the International Journal of Pharmacology added to biological evidence that L. gracile leaves possess significant hepatoprotective activity, based on results of ethanol extract testing against carbon tetrachloride-induced liver damage in mice. Several flavonoids purified from ethanolic extracts of the leaves of L. gracile show potent antioxidant and hepatoprotective effects. Various studies have identified the presence of luteolin, isoorientin, and apigenin in the ethanol extract of L. gracile. These three compounds have been reported to protect against CCl₄-induced microsomal lipid peroxidation.

5.6 Bone Health / Anti-osteoporotic Activity

Evidence level: Animal and cell studies only; no human clinical trials identified.

A 2022 study published in the International Journal of Molecular Sciences (PMC9699449), by researchers at the Korea Institute of Oriental Medicine, examined whether L. gracile affects bone metabolism, an area not previously investigated. The study examined the effects of a water extract of the leaves of L. gracile (WELG) on osteoclast differentiation and bone loss and explored its underlying mechanisms. WELG was found to inhibit osteoclastogenesis by suppressing both RANKL-induced early activation of MAPKs and NF-κB, and RANKL-induced modulation of the positive and negative regulators of osteoclastogenesis in osteoclast precursors. In vivo study demonstrated that WELG protects against bone loss, weight gain, and fat accumulation without affecting uterine atrophy in an ovariectomy-induced postmenopausal osteoporosis mouse model. Photochemical analysis of WELG identified active constituents known to have bone-protective effects. Overall, the results suggest that WELG can be a potential candidate for therapy and prevention of postmenopausal osteoporosis. These findings are limited to animal models and require human clinical validation.

5.7 Antitumor Activity

Evidence level: In vitro and animal (in vivo) mouse tumor models only; no human clinical studies identified.

A 2026 study in Foods (MDPI) characterized the water-soluble polysaccharide (LGP) of L. gracile and tested its antitumor activity using the H22 hepatocellular carcinoma tumor-bearing mouse model. Its in vivo antitumor activity in the H22 tumor-bearing mice model was studied. Compared with the model group, LGP treatment improved body responses, immune organs, and SOD and MDA levels. An ethanol extract of Lophatheri Herba was separately reported by Kim et al. (2016) in Scientific Reports as exhibiting anti-cancer activity in human cancer cells by suppression of metastatic and angiogenic potential, though all results remain preclinical.

5.8 Cardiovascular / Vasorelaxant Activity

Evidence level: Isolated tissue (ex vivo) and cell-based studies; no human clinical trials identified.

The ethanol extract of L. gracile showed vasorelaxant activity in isolated aortic tissue of rats, with the mechanism of action via an endothelial-dependent NO-cGMP signaling pathway which is in part related to the function of K⁺ channels. This work was reported as a conference abstract (FASEB Journal, 2010). No full clinical cardiovascular outcome studies were identified.

5.9 Use in Multi-herb Clinical Preparations

L. gracile forms part of the ingredient of a herbal preparation that was the subject of study for the treatment of minimal brain dysfunction (MBD). Zhang et al. found that the group receiving this preparation had their clinical symptoms and signs eliminated, their IQ raised by 10 units, the EEG showed recovery, and there were no cases of recurrence during the first six months of follow-up after recovery. However, since L. gracile was one component of a multi-herb formula in this study, the results cannot be attributed to it as an isolated ingredient.

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6. Body Systems and Health Areas Associated with Lophatherum Leaf

• Urinary/renal system: diuresis, relief of urinary tract inflammation, strangury, hematuria; uric acid excretion and reduction of hyperuricemia (preclinical)
• Immune/infectious disease: antiviral activity against RSV and SARS-CoV-2 (in vitro/animal); antibacterial activity against MDR E. coli (in vitro)
• Metabolic/endocrine system: hypoglycemic effects in T2DM models, modulation of lipid metabolism, gut microbiota regulation, pancreatic lipase inhibition (animal models)
• Hepatic system: hepatoprotective effects against toxic liver injury, antioxidant activity (animal models)
• Skeletal system: inhibition of osteoclastogenesis and protection against ovariectomy-induced bone loss (animal and cell models)
• Cardiovascular system: vasorelaxation via endothelial NO-cGMP pathway (isolated tissue)
• Gastrointestinal system: TCM use for stomach heat; modulation of gut microbiota composition and SCFA levels (animal models)
• Oral health: TCM use for mouth sores and gum ulcers; antibacterial flavonoid constituents
• Neurological/behavioral: traditional use for irritability, restlessness, and insomnia due to heat; component of multi-herb formulas studied in MBD

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7. Dosage Forms and Reported Dosages

7.1 Traditional Decoction

In TCM practice, lophatherum leaf is most commonly prepared as a water decoction. In the classical formula Zhu Ye Shi Gao Tang, Dan Zhu Ye (Lophatherum stem and leaves) is used in a quantity of 9–15 grams. This 9–15 g range for dried herb per decoction dose is consistent with the herb's listing in the Chinese Pharmacopoeia for standard clinical use.

7.2 Preclinical Study Dosages

The following dosages were used in preclinical (animal) studies as reported in peer-reviewed publications. These are not clinical human dosages and are provided only for reference:

• In the ovariectomy-induced osteoporosis mouse study (Lee et al., 2022, Int. J. Mol. Sci., PMC9699449), a water extract of L. gracile leaves (WELG) was administered; specific dose levels are detailed in the full paper.
• In the T2DM mouse study (2025, PMC12468491), LGB (dried leaf extract) was administered to T2DM model mice; metabolomics confirmed modulation of lipid and carbon pathways at the doses evaluated.

7.3 Concentrated Extract Preparations

Commercial concentrated extracts are produced by water decoction, low-pressure low-temperature concentration, and vacuum or spray-drying. Concentrated Chinese herbs are extracts made from the water decoction of bulk herbs, concentrated at low pressure and low temperature, and then instantly dried. Compared to bulk herbs, which must be boiled in water for long periods, concentrated herbs may be quickly and easily prepared and administered. These preparations are sold in granule, capsule, and tablet forms, with concentration ratios typically reported as 5:1 relative to raw herb.

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8. Safety Considerations and Known Interactions

8.1 General Safety Profile

Lophatherum leaf (LGB) is both a traditional medicine and an edible plant. It has an extensive historical record of food and medicinal use in China without documented major systemic toxicity at traditional decoction doses. No dedicated acute or chronic human toxicity studies specific to lophatherum leaf as an isolated ingredient were identified in the peer-reviewed literature reviewed for this article. The herb is not listed among the substances with "small toxicity," "toxicity," or "strong toxicity" classifications in published analyses of the Chinese Pharmacopoeia's toxic herb categories.

8.2 Pharmacopeial Cautions

As listed in the Chinese Pharmacopoeia, L. gracile has actions including clearing heat fire, promoting diuresis, and relieving stranguries. Traditional TCM practice notes caution in individuals with heat arising from yin deficiency, where the cold and draining nature of the herb may exacerbate underlying constitutional weakness. The herb's traditional properties are described as sweet and mild in taste, with a cold quality.

8.3 Noted Drug Interactions and Cautions

Pharmacological studies have noted that Lophatherum gracile extracts may raise blood sugar levels. Patients taking insulin or oral hypoglycemic agents should be aware of this potential interaction, although the clinical significance at standard decoction doses is uncertain. This observation runs counter to the predominantly hypoglycemic direction reported in animal models, indicating a pharmacological complexity not yet resolved by clinical studies.

Dan Zhu Ye has mild antipyretic properties and could theoretically enhance the fever-reducing effects of drugs like acetaminophen or NSAIDs. No formal human pharmacokinetic drug-interaction studies were identified in the literature.

8.4 Oral Bioavailability Limitation

A pharmacokinetic limitation noted across multiple studies applies to the flavonoid constituents: most flavonoids have low oral bioavailability; therefore the in vivo anti-inflammatory effect and anti-SARS-CoV-2 infection activity require further study before clinical application. This caveat applies broadly to the flavone C-glycoside class (isoorientin, orientin, vitexin, isovitexin) that constitutes the primary active fraction.

8.5 Quality Variability

The leaf of L. gracile has been officially listed in the Chinese Pharmacopoeia as a crude drug; however, there is no quality control stated beyond character identification of the herb. Research has confirmed that the content of characteristic components — including chlorogenic acid, kaempferol, isovitexin, luteolin, and isoorientin — varies by geographic origin. This variability in constituent levels has direct implications for consistency of biological activity across different supply sources.

8.6 Gaps and Limitations of the Evidence Base

The overall evidence base for lophatherum leaf, while growing, is characterized by the following important limitations: (1) the large majority of pharmacological studies are in vitro or performed in rodent models, with no published standalone randomized controlled trials in humans for any specific clinical indication; (2) multi-herb formulas containing Dan Zhu Ye have been evaluated clinically, but outcomes cannot be attributed to lophatherum as an isolated agent; (3) the mechanistic studies — while sophisticated in their use of metabolomics, network pharmacology, and molecular docking — have not been translated to clinical validation; and (4) the bioactivities of individual flavonoids such as isoorientin, luteolin, apigenin, vitexin, and chlorogenic acid are not always reflected in the overall activity of the herb. There are relatively few active ingredient and spectral effect relationship studies of Danzhuye, and the connection between the pharmacological effects and its chemical composition should be investigated more deeply.

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References

• He Q et al. (2024). Research and utilization status of Lophatherum gracile: A medicinal and food homologous plant. ScienceDirect (Journal of Ethnopharmacology related publication).
• Lee S-J et al. (2022). Lophatherum gracile Bronghiart Suppresses Receptor Activator of Nuclear Factor Kappa-B Ligand-Stimulated Osteoclastogenesis and Prevents Ovariectomy-Induced Osteoporosis. Int. J. Mol. Sci., 23(22), 13942. PMC9699449.
• Spectrum–effect relationship between ultra-high-performance liquid chromatography fingerprints and antioxidant activities of Lophatherum gracile Brongn. PMC9094454.
• Wang Y et al. (2019). Antiviral activity of ethanol extract of Lophatherum gracile against respiratory syncytial virus infection. J. Ethnopharmacol. PubMed PMID 30391397.
• Lai K-H et al. (2023). Anti-inflammatory and antiviral activities of flavone C-glycosides of Lophatherum gracile for COVID-19. PMC9812844.
• Anti-inflammatory and antiviral activities of flavone C-glycosides of Lophatherum gracile for COVID-19. PubMed PMID 36627926.
• Lophatherum gracile Brongn. attenuates neutrophilic inflammation through inhibition of JNK and calcium. J. Ethnopharmacol. (2021). ScienceDirect.
• Bioactive Component Screening and Mechanistic Study of the Anti-Diabetic Activity of Lophatherum gracile Brongn Extract. Curr. Issues Mol. Biol. 2025. PMC12468491.
• Bioactive Component Screening and Mechanistic Study of the Anti-Diabetic Activity of Lophatherum gracile Brongn Extract. Curr. Issues Mol. Biol. 2025. DOI: 10.3390/cimb47090779.
• Zheng et al. (2023). Flavonoids from Lophatherum gracile Brongn. Ameliorate Liver Damages in High-Fat Diet and Streptozotocin-Induced Diabetic Mice by Regulating PI3K/AKT and NF-Kappa B Pathways. J. Food Biochem. Wiley.
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• Antibacterial activity and mechanism of luteolin isolated from Lophatherum gracile Brongn. against multidrug-resistant Escherichia coli. Front. Pharmacol. 2024. PMC11232434.
• He Q et al. (2016). Hepatoprotective Activity of Lophatherum gracile Leaves of Ethanol Extracts Against Carbon Tetrachloride-induced Liver Damage in Mice. Int. J. Pharmacol., 12(4), 387–393.
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• Antiviral activity of ethanol extract of Lophatherum gracile against respiratory syncytial virus infection. J. Ethnopharmacol. ScienceDirect.
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• Lophatherum gracile Bronghiart Suppresses RANKL-Stimulated Osteoclastogenesis and Prevents Ovariectomy-Induced Osteoporosis. Int. J. Mol. Sci. 2022, 23(22), 13942. MDPI.
• US Patent 7811997 — Composition containing total triterpenoid sapogenins extracted from bamboo (references Lophatherum gracile phytochemistry).