Jin Yin Hua

Jin Yin Hua (Honeysuckle Flower) is the dried flower bud or opened flower of Lonicera japonica Thunb., an evergreen twining vine in the family Caprifoliaceae. In the traditional TCM classification system, Jin Yin Hua is considered sweet in flavor and cold in nature. It enters the Lung, Heart, Stomach, and Large Intestine meridians, giving it a central role in formulas that address heat-toxin accumulation, exterior Wind-Heat, and warm-febrile disease patterns.

Botanical description: Lonicera japonica is a vigorous, woody, twining vine that can climb to heights of 3–10 meters. The stems are hollow, hairless, and initially green, turning brown or purplish-brown with age. The leaves are opposite, simple, ovate to elliptic, 3–8 cm long and 2–4 cm wide, with a short petiole and a finely hairy or glabrous surface. The plant is best known for its distinctive flowers: they are borne in pairs (hence the Chinese name Jin Yin Hua, meaning "gold and silver flower"), and the tubular corollas change color from white (when newly opened) to yellow-gold (after pollination), so that a single inflorescence displays both white and yellow flowers simultaneously. The fruit is a small, globose, bluish-black berry containing several seeds. The flower buds and newly opened flowers constitute the medicinal organ.

Habitat and cultivation: L. japonica is native to East Asia, including China, Japan, and Korea, and has been widely naturalized in many other temperate and subtropical regions worldwide. In China, the primary producing regions include Shandong (especially Pingyi County, historically the most famous production area), Henan, Hebei, and Shaanxi provinces. The plant prefers well-drained soils in full sun to partial shade and is commonly found along forest margins, roadways, stream banks, and on slopes. Cultivation typically begins with cuttings or layering, and the plants begin producing harvestable flower buds in the second or third year. The flower buds are harvested in early summer (May–June), ideally before they fully open, as chlorogenic acid and other active compound content is highest at this stage. The harvested buds are dried in the shade or at low temperature (below 60°C) to preserve the volatile oil and phenolic acid content.

Quality markers: The Chinese Pharmacopoeia specifies that high-quality Jin Yin Hua should consist of intact, plump flower buds that are white on the outside and yellowish on the inside, with a characteristic aromatic odor and a slightly sweet, mildly bitter taste. Premium-grade material is described as being dry, unmoistened, free from mold, and with a chlorogenic acid content meeting the pharmacopoeial minimum threshold (not less than 1.5% on a dried basis). Luteoloside (luteolin-7-O-glucoside) is another pharmacopoeial quality marker. According to the latest pharmacopoeial standards, both chlorogenic acid and luteoloside must meet specified minimum content requirements for commercial Jin Yin Hua preparations.

In the traditional Chinese medicine theoretical framework, Jin Yin Hua is understood in terms of its effects on specific patterns of disharmony (zheng). Because Jin Yin Hua enters the Lung, Heart, Stomach, and Large Intestine meridians and has a sweet and cold quality, it is traditionally indicated for a range of patterns involving heat-toxin, exterior Wind-Heat, and warm-febrile disease.

Dispersing Wind-Heat and clearing the upper burner: Jin Yin Hua is one of the most important herbs in TCM for resolving exterior Wind-Heat patterns. These patterns may present as fever, slight aversion to wind, sore throat, headache, cough with yellow sputum, and a red-tipped tongue with a thin white or slightly yellow coating. Jin Yin Hua is particularly valued for its ability to clear heat from the Lung and throat. It is a core ingredient in Yin Qiao San (Lonicera and Forsythia Powder), the quintessential formula for early-stage Wind-Heat exterior patterns. It is commonly combined with Huang Qin (Scutellaria root) to strengthen the heat-clearing effect, and with Lian Qiao (Forsythia fruit) as a complementary herb pair for upper respiratory heat patterns.

Clearing heat and resolving toxicity: Jin Yin Hua is considered one of the premier herbs in the TCM pharmacopoeia for clearing heat-toxin (re du). In TCM theory, heat-toxin accumulation can manifest as various skin and tissue conditions, including carbuncles, boils, sores, erysipelas, and swollen lymph nodes with heat signs (redness, swelling, heat, and pain). Jin Yin Hua is traditionally used both internally and externally (as a wash or poultice) for these presentations. It is a key herb in Wu Wei Xiao Du Yin (Five-Ingredient Toxin-Resolving Decoction), where it serves alongside other potent heat-clearing and detoxifying herbs. It may also be combined with Huang Lian (Coptis rhizome) for internal heat-toxin patterns with damp-heat.

Cooling blood and treating warm-febrile disease: In the warm disease (wen bing) school of TCM, Jin Yin Hua is used for heat patterns at the qi level and the ying (nutrient) level. At the qi level, it helps clear high fever, irritability, and thirst. At the ying level, it is traditionally used when heat has penetrated deeper, presenting as fever at night that subsides in the morning, a faint skin rash, and a crimson tongue. Its ability to simultaneously clear heat and resolve toxicity while entering both the qi and ying levels makes it a versatile herb in warm disease formulations.

Summerheat-heat patterns: Jin Yin Hua is traditionally used for conditions arising from exposure to summerheat, which may present as high fever, headache, dizziness, thirst, and irritability. It is sometimes combined with heat-clearing and fluid-generating herbs in summerheat-clearing formulas.

Classical literature references: Jin Yin Hua was first recorded in the Ming Yi Bie Lu (Miscellaneous Records of Famous Physicians, circa 500 CE), where it was described as a herb for treating cold-damage febrile diseases, erysipelas, and malignant sores. The Ben Cao Gang Mu (Compendium of Materia Medica, 1596 CE) by Li Shizhen described Jin Yin Hua as being good for "clearing heat, resolving toxicity, and dispersing wind-heat," and noted its traditional use for swollen sores, carbuncles, dysentery, and various febrile conditions. The Wen Bing Tiao Bian (Systematic Differentiation of Warm Diseases, 1798 CE) by Wu Jutong established Jin Yin Hua as a primary herb in the warm disease therapeutic system, particularly in the formula Yin Qiao San.

Jin Yin Hua contains a diverse range of bioactive compounds that have been the subject of extensive phytochemical and pharmacological investigation. The following overview summarizes the major chemical constituents identified in the flower buds and flowers of Lonicera japonica and what is currently known about them from published research.

Chlorogenic acid (CGA): Chlorogenic acid is a phenolic acid ester formed from caffeic acid and quinic acid, and it is the single most abundant and pharmacologically studied compound in Jin Yin Hua. It serves as a primary quality-control marker in the Chinese Pharmacopoeia for Jin Yin Hua. Chlorogenic acid has been investigated in pre-clinical research for a wide range of potential pharmacological activities, including anti-inflammatory, antioxidant, antiviral (including inhibition of influenza neuraminidase), hepatoprotective, and potential anti-hyperglycemic effects. A review by Huang et al. published in Pharmaceuticals (2025) summarized evidence that chlorogenic acid from sources including Lonicera japonica may act through multiple pathways for cardiovascular protection. However, most evidence comes from animal and in-vitro studies; robust human clinical data are limited.

Luteolin and luteoloside (luteolin-7-O-glucoside): Luteolin is a flavone compound, and its glycoside luteoloside is another pharmacopoeial quality marker for Jin Yin Hua. These flavonoid compounds have been studied for their anti-inflammatory, antioxidant, and potential neuroprotective properties. Pre-clinical studies suggest that luteolin may inhibit pro-inflammatory mediators (such as TNF-α, IL-6, and COX-2) and modulate NF-κB signaling pathways. A review by Law et al. published in Molecules (2024) examined the pharmacological activities of chrysoeriol and related flavonoid constituents derived from Lonicerae japonicae flos in skin disease models. The clinical relevance of these compounds in the context of whole-herb Jin Yin Hua preparations requires further investigation.

Secoiridoid glycosides: Jin Yin Hua contains secoiridoid glycosides, including secologanic acid, secologanoside, and related compounds. These are a class of iridoid-derived secondary metabolites that contribute to the bitter taste and some of the pharmacological activities of the herb. Research has suggested that secoiridoid glycosides from Lonicera japonica may have anti-inflammatory and neuroprotective properties. Kashiwada et al. (2013) reported novel secoiridoid glucoside conjugates isolated from the flower buds of L. japonica. The specific clinical contributions of secoiridoid glycosides within whole-herb Jin Yin Hua are not fully established.

Volatile oils: Jin Yin Hua contains a complex mixture of volatile oil constituents that contribute to its characteristic aromatic odor. Major components identified include linalool, geraniol, hexanol, and various terpenoid compounds. The volatile oils are believed to contribute to the herb's traditional ability to disperse Wind-Heat and relieve sore throat. However, the specific pharmacological activities of the volatile oil fraction are less well studied compared to the phenolic acid and flavonoid constituents.

Other constituents: Jin Yin Hua also contains polysaccharides, saponins, tannins, and various other secondary metabolites. More than 140 chemical compounds have been isolated from Lonicera japonica according to the comprehensive review by Shang et al. (2011). Most research on these secondary compounds remains at the pre-clinical stage, and their specific contributions to the pharmacological profile of whole-herb Jin Yin Hua are not fully understood.

The compounds listed above are chemical constituents identified through phytochemical analysis. Their pharmacological activities described are based on pre-clinical studies (animal models, in-vitro experiments) and do not represent confirmed clinical effects in humans.

Jin Yin Hua is a core ingredient in many of the most important classical and modern formulas in the TCM tradition for clearing heat, resolving toxicity, and treating exterior Wind-Heat. Below are three key formulas that feature Jin Yin Hua as a primary or significant component, along with their traditional indications and the role Jin Yin Hua plays in each composition.

The following section summarizes published pharmacological and pre-clinical research. Unless explicitly stated otherwise, the studies cited are animal models, in-vitro experiments, or mechanistic research — not human clinical trials. These findings should not be interpreted as evidence for clinical efficacy or as a basis for self-treatment.

Anti-inflammatory effects: Chlorogenic acid, luteolin, and other constituents in Jin Yin Hua have been extensively studied for anti-inflammatory activity. Pre-clinical research has demonstrated that chlorogenic acid may reduce levels of pro-inflammatory cytokines (TNF-α, IL-1β, IL-6), inhibit NF-κB and MAPK signaling pathways, and suppress cyclooxygenase-2 (COX-2) expression. A study by Kweon et al. published in Nutrients (2024) reported that honeysuckle leaf extract exhibited anti-inflammatory effects against lipopolysaccharide-induced neuroinflammation in BV2 microglia. The emerging role of honeysuckle flower in inflammatory bowel disease was reviewed by Muro et al. in Frontiers in Nutrition (2025), with bioactive metabolites such as luteolin, quercetin, chlorogenic acid, and saponins showing significant therapeutic potential in IBD models. While these findings are scientifically interesting, their clinical significance for human inflammatory conditions has not been established.

Antiviral activity: Jin Yin Hua and its constituents, particularly chlorogenic acid, have been studied for antiviral properties. A study by Ding et al. published in Scientific Reports(2017, PMID: 28393840) investigated the antiviral activity of chlorogenic acid against influenza A (H1N1/H3N2) virus and its inhibition of neuraminidase, an important antiviral target. The study found that chlorogenic acid exhibited dose-dependent inhibition of neuraminidase activity. Additionally, a 2024 study published in Journal of Chromatography A (Yuan et al., PMID: 38797137) screened potential SARS-CoV-2 fusion inhibitors from Lonicerae japonicae Flos using an at-line nanofractionation platform. A 2025 systematic review by Cao et al. published in Fitoterapia (PMID: 40721118) examined Lonicera japonica in acute lung injury, highlighting its role as a cornerstone herb in TCM for conditions including influenza and COVID-19-related lung injury. It is important to emphasize that these are pre-clinical findings and do not constitute clinical evidence for antiviral efficacy in humans.

Antibacterial activity: Pre-clinical studies have reported that extracts of Jin Yin Hua exhibit antibacterial activity against a range of Gram-positive and Gram-negative bacteria, including Staphylococcus aureus, Streptococcus species, Escherichia coli, and Pseudomonas aeruginosa. The volatile oil fraction and chlorogenic acid are considered to be the primary antibacterial constituents. However, the clinical significance of these in-vitro antibacterial findings is uncertain, as the concentrations required for antibacterial activity in-vitro may not be achievable through oral administration of whole-herb preparations.

Antioxidant and hepatoprotective effects: Multiple pre-clinical studies have reported antioxidant activity for Jin Yin Hua extracts and their constituents. Chlorogenic acid and luteolin have been shown to scavenge free radicals, enhance endogenous antioxidant enzyme activity (superoxide dismutase, glutathione peroxidase), and reduce lipid peroxidation in animal models. Hepatoprotective effects have also been reported, with Jin Yin Hua extracts showing potential to protect against liver injury induced by various hepatotoxic agents in animal studies. These findings provide mechanistic insights and do not establish clinical efficacy for liver conditions in humans.

Cardiovascular effects of chlorogenic acid: A comprehensive review by Huang et al. published in Pharmaceuticals (2025, PMID: 41011225) summarized advances in the pharmacological properties, molecular mechanisms, and bioavailability strategies of chlorogenic acid in cardiovascular diseases therapy. The review noted that chlorogenic acid, widely found in Lonicera japonica and other plants, may act through multiple pathways including anti-inflammatory, antioxidant, and lipid-modulating mechanisms. However, clinical data supporting these cardiovascular effects in humans remain limited.

What the research does NOT show: Despite promising pre-clinical signals, the research on Jin Yin Hua and its active compounds does NOT demonstrate conclusive clinical efficacy for any specific disease in humans. There is no robust evidence from large-scale, randomized, placebo-controlled clinical trials that Jin Yin Hua can treat, cure, or prevent viral infections (including influenza or COVID-19), inflammatory disorders, bacterial infections, or any other medical condition. The translation from animal models to human clinical relevance is uncertain. This page does not endorse Jin Yin Hua as a treatment for any condition.

Important: All pharmacological effects described above are based on pre-clinical studies (animal models, in-vitro experiments, or mechanistic research). They do not constitute evidence of clinical efficacy in humans. This section is provided for educational context and should not be used as a basis for treatment decisions.

General safety profile: Jin Yin Hua is one of the most widely used herbs in TCM practice and is generally considered to have a favorable safety profile when used appropriately in formula combinations. It is also used as a dietary herb in teas and food products in China. However, like all herbal products, it is not free of risk. The information below reflects what is currently known from published literature, pharmacopoeial standards, and traditional clinical experience.

Spleen and Stomach deficiency-cold: In traditional TCM theory, Jin Yin Hua is cold in nature. Individuals with Spleen and Stomach deficiency-cold — characterized by loose stools, poor appetite, abdominal coldness and discomfort, a pale tongue with a white coating, and a tendency toward cold extremities — should generally avoid Jin Yin Hua or use it only with appropriate warming herbs. Its cold properties may worsen digestive weakness and increase diarrhea or loose stools in such individuals.

Qi deficiency with cold: Because Jin Yin Hua is cold and has a dispersing nature, it may theoretically further deplete Qi in individuals with significant Qi deficiency and cold patterns. In such cases, it should be used only when there is a clear heat-toxin indication that outweighs the cold-depleting potential, and should be combined with Qi-tonifying herbs under professional guidance.

Pregnancy and lactation: Jin Yin Hua does not have a specific classical contraindication during pregnancy in most traditional TCM texts. However, some traditional sources advise cautious use during pregnancy because of its cold nature and potential effects on Qi circulation. It is worth noting that a historical pharmacological study from 1986 reported potential anti-pregnancy effects of Lonicera japonica extracts in animal models. While these findings have not been replicated in humans and the clinical relevance is uncertain, they warrant caution. Modern pre-clinical data on Jin Yin Hua constituents in pregnancy are insufficient to fully establish safety. Do not use Jin Yin Hua during pregnancy without direct supervision from a qualified healthcare professional.

Drug interactions: Pre-clinical data suggest that chlorogenic acid, the principal active compound in Jin Yin Hua, may affect hepatic cytochrome P450 enzyme activity (particularly CYP2C19 and CYP3A4), which could theoretically alter the metabolism of drugs processed through these pathways. Because Jin Yin Hua has demonstrated antiviral activity in pre-clinical models, there is theoretical potential for additive or antagonistic interactions with antiviral medications. Its anti-inflammatory properties could theoretically interact with immunosuppressive drugs or NSAIDs. Clinical interaction data for whole-herb Jin Yin Hua are very limited. Consult a qualified healthcare professional before combining Jin Yin Hua with any prescription medications.

Reported side effects: Based on available reports, side effects associated with Jin Yin Hua are generally rare and mild when used at appropriate doses. Occasional reports include mild gastrointestinal discomfort (nausea, abdominal pain, or diarrhea, particularly in individuals with pre-existing Spleen weakness), dizziness, and allergic reactions (skin rash, pruritus) in sensitive individuals. Notably, injectable formulations containing Jin Yin Hua (such as Shuang Huang Lian injection) have been associated with more serious adverse reactions including anaphylaxis, and their use requires clinical supervision. Any suspected adverse effects should be reported to a healthcare professional.

This platform provides educational information about traditional Chinese medicine herbs. It does not recommend, endorse, or prescribe the use of Jin Yin Hua or any other herbal product for the treatment of any medical condition. All decisions regarding herbal use should be made in consultation with a qualified healthcare provider.