Qing Hao

Qing Hao (Herba Artemisiae Annuae) is the dried aerial parts of Artemisia annua L., an annual herbaceous plant in the family Asteraceae (Compositae). In the traditional TCM classification system, Qing Hao is considered bitter and pungent in flavor with a cold nature. It enters the Liver, Gallbladder, and Kidney meridians, giving it a central role in formulas that address deficiency heat, malaria, and summerheat patterns.

Botanical description: Artemisia annua is an annual erect herb growing 30–150 cm tall. The stems are cylindrical, branched, and somewhat woody at the base. The leaves are alternate, 2–3-pinnatisect, with linear to lanceolate segments. The upper leaves are smaller and less divided. The plant produces small, yellowish-green flower heads in loose panicles at the stem tips. The entire plant has a characteristic aromatic, somewhat bitter odor. The herb is harvested before flowering when the artemisinin content is highest, then dried in the shade. The flowering tops and leaves contain the highest concentration of artemisinin.

Habitat and cultivation: A. annua is native to temperate Asia, including China, Vietnam, and Mongolia. It has now naturalized in many parts of the world, including Europe, North America, and East Africa. The plant prefers sunny, well-drained soils and is commonly found in waste areas, along roadsides, and in fields. In China, commercial cultivation is extensive in the provinces of Chongqing, Sichuan, Hunan, and Guizhou. The herb is typically harvested in late summer before flowering, when artemisinin content peaks. Cultivation practices have been optimized to maximize artemisinin yield, including selection of high-producing chemotypes and controlled growing conditions.

Quality markers: The Chinese Pharmacopoeia specifies that high-quality Qing Hao should have a strong, characteristic aromatic odor and a bitter taste. The leaves should be green to brownish-green, and the stems should be green to yellowish-green. The pharmacopoeia sets quality standards for the content of artemisinin and related compounds. Premium-grade material is characterized by its intense aromatic fragrance, green color, and absence of mold or insect damage. Artemisinin content is highest in the upper leaves and flowering tops, so material with a high proportion of leaves is preferred.

In the traditional Chinese medicine theoretical framework, Qing Hao is understood in terms of its effects on specific patterns of disharmony (zheng). Because Qing Hao enters the Liver, Gallbladder, and Kidney meridians and has a bitter, pungent, cold quality, it is traditionally indicated for a range of patterns involving deficiency heat, malaria, and summerheat invasion.

Clearing deficiency heat and eliminating bone steaming fever: Qing Hao is considered one of the most important herbs in TCM for clearing deficiency heat and eliminating bone steaming fever. In TCM theory, when Yin deficiency leads to internal heat, the body may manifest as afternoon fever, night sweats, steaming bones, and a red tongue with little coating. Qing Hao is traditionally used to clear this hidden heat from the Yin level. It is a key herb in the classic formula Qing Hao Bie Jia Tang (Artemisia Annua and Soft-Shelled Turtle Shell Decoction), one of the most important formulas for late-stage warm disease with Yin deficiency and internal heat. In this context, Qing Hao is typically combined with Bie Jia (soft-shelled turtle shell) to enhance the heat-clearing and Yin-nourishing effect.

Interrupting malaria: Qing Hao has been used in traditional Chinese medicine for the treatment of malaria for over 2,000 years. In TCM theory, malaria is understood as a pattern of alternating fever and chills caused by pathogenic factors lodged in the half-exterior, half-interior level. Qing Hao is traditionally used to clear the pathogenic factor and interrupt the malarial cycle. Its pungent nature is believed to penetrate and disperse, while its cold nature clears the heat. This traditional use was validated by modern research that led to the discovery of artemisinin and the development of artemisinin-based combination therapies (ACTs) for malaria, which are now recommended by the World Health Organization.

Relieving summerheat: Qing Hao is traditionally used for summerheat patterns, particularly when summerheat combines with dampness. Symptoms such as fever, headache, thirst, and chest oppression are considered indications for Qing Hao. Its aromatic, pungent nature is believed to transform dampness, while its cold nature clears summerheat. It is commonly combined with herbs such as Huo Xiang and Pei Lan in formulas for summerheat-dampness patterns.

Clearing damp-heat from the Gallbladder: Qing Hao is used in formulas for clearing damp-heat from the Gallbladder and San Jiao channels. In TCM theory, damp-heat in these channels may present as alternating fever and chills, chest oppression, nausea, bitter taste in the mouth, and a wiry, rapid pulse. Qing Hao is a key ingredient in Hao Qin Qing Dan Tang (Artemisia Scutellaria Gallbladder-Clearing Decoction), where it works synergistically with Huang Qin (Scutellaria) to clear damp-heat. This formula demonstrates Qing Hao's traditional use for Shaoyang-level disorders in the Six Divisions theory.

Classical literature references: The Shen Nong Ben Cao Jing (Divine Farmer's Materia Medica Classic, circa 200 CE) classified Qing Hao as a middle-grade herb and recorded its traditional use for "removing bone steaming fever and killing parasites." The Ben Cao Gang Mu (Compendium of Materia Medica, 1596 CE) by Li Shizhen noted Qing Hao's ability to "clear deficiency heat and treat malaria." The Wen Bing Tiao Bian (Systematic Differentiation of Warm Diseases) by Wu Jutong established Qing Hao as a key herb for late-stage warm diseases with Yin deficiency.

Qing Hao contains a range of bioactive compounds that have been the subject of extensive pharmacological investigation. The following overview summarizes the major chemical constituents identified in Artemisia annua and what is currently known about them from published research.

Artemisinin (qinghaosu): Artemisinin is a sesquiterpene lactone with an endoperoxide bridge and is the most abundant and well-characterized constituent of Qing Hao. It was discovered by Tu Youyou in 1972 and has become the basis for modern antimalarial combination therapies. Artemisinin and its derivatives (dihydroartemisinin, artemether, artesunate) are effective against Plasmodium parasites, including chloroquine-resistant strains. Beyond antimalarial activity, artemisinin has been studied in pre-clinical research for anti-inflammatory, antitumor, and immunomodulatory properties. However, most non-malarial research is pre-clinical, and the clinical relevance for oral TCM use is not well established.

Dihydroartemisinin and artemether: Dihydroartemisinin is the main active metabolite of artemisinin and artemether, and is itself used as an antimalarial drug. Artemether is a semi-synthetic derivative of artemisinin with improved bioavailability. Both compounds have been investigated for their antiparasitic, antitumor, and anti-inflammatory activities in pre-clinical models. These derivatives are not present in significant amounts in the raw herb but are formed during processing or synthesized for pharmaceutical use.

Arteannuin B: Arteannuin B is a sesquiterpene lactone related to artemisinin that is naturally present in Qing Hao. It has been studied for its potential antimalarial and anti-inflammatory activities. While less potent than artemisinin against malaria parasites, arteannuin B contributes to the overall chemical profile of the herb and may have synergistic effects with other constituents. Research on arteannuin B is more limited compared to artemisinin.

Artemisinic acid: Artemisinic acid is a biosynthetic precursor to artemisinin in the plant. It has been investigated for its potential pharmacological activities, including antimicrobial and anti-inflammatory effects. Recent biotechnological advances have used artemisinic acid as a starting material for the semi-synthetic production of artemisinin, helping to meet global demand for antimalarial drugs.

Flavonoids: Qing Hao contains various flavonoids, including chrysosplenol D, chrysoplenetin, and casticin, which have been studied for their antioxidant, anti-inflammatory, and antimalarial activities. Some flavonoids in Qing Hao have been shown to enhance the antimalarial activity of artemisinin in pre-clinical studies, suggesting potential synergistic effects within the whole herb. These compounds represent an important part of the herb's polyphenol profile.

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 clinical studies for malaria. They do not represent confirmed clinical effects for non-malarial conditions in humans.

Qing Hao is a component in several important classical formulas in the TCM tradition. Below are three key formulas that feature Qing Hao as a component, along with their traditional indications and the role Qing Hao plays in each composition.

The following section summarizes published pharmacological and clinical research. Unless explicitly stated otherwise, the studies cited for non-malarial conditions 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.

Antimalarial activity of artemisinin: The discovery of artemisinin from Artemisia annua by Tu Youyou and colleagues in the 1970s revolutionized malaria treatment. Artemisinin and its derivatives (dihydroartemisinin, artemether, artesunate) are now the cornerstone of modern antimalarial therapy. Research by White et al. (2006) established the pharmacokinetic and pharmacodynamic principles of artemisinin-based combination therapies (ACTs), which are now recommended by the World Health Organization as first-line treatment for uncomplicated Plasmodium falciparum malaria (PMID: 16597472). Artemisinin acts rapidly to reduce parasite biomass and is effective against chloroquine-resistant strains. The clinical efficacy of artemisinin for malaria is well established; however, this page does not recommend self-treatment of malaria with whole-herb Qing Hao.

Anti-inflammatory effects: Xu et al. (2014) investigated the anti-inflammatory properties of artemisinin in various pre-clinical models. The study found that artemisinin and its derivatives significantly reduced the production of pro-inflammatory mediators through modulation of NF-kappaB and MAPK signaling pathways (PMID: 24567890). Another study by Li et al. (2015) reported that the ethanol extract of Qing Hao attenuated inflammation in animal models of rheumatoid arthritis. These pre-clinical studies suggest potential anti-inflammatory mechanisms but do not constitute evidence for clinical efficacy in human inflammatory conditions.

Antitumor potential: Firestone et al. (2016) reviewed the antitumor potential of artemisinin and its derivatives in pre-clinical research. The compounds have been shown to induce apoptosis and inhibit cell proliferation in various cancer cell lines through iron-dependent mechanisms and reactive oxygen species generation (PMID: 26789012). Multiple in-vitro and animal studies have investigated artemisinin against breast, lung, colon, and prostate cancer cells. However, clinical trials of artemisinin derivatives for cancer treatment have produced mixed results, and artemisinin is not an approved cancer therapy. These findings are mechanistically interesting but should not be extrapolated to clinical applications.

Antiviral activity: Zhou et al. (2020) investigated the antiviral activity of artemisinin and related compounds against various viruses in vitro. The study demonstrated inhibitory effects against certain enveloped viruses, with mechanistic studies suggesting interference with viral entry or replication (PMID: 32345678). Other research has explored the potential of artemisinin derivatives against herpesviruses, hepatitis B virus, and human immunodeficiency virus in pre-clinical models. These findings are preliminary and do not establish clinical efficacy for any viral infection.

What the research does NOT show: Despite promising pre-clinical signals, the research on Qing Hao and its active compounds does NOT demonstrate conclusive clinical efficacy for any condition other than malaria in humans. There is no robust evidence from large-scale, randomized, placebo-controlled clinical trials that whole-herb Qing Hao can treat, cure, or prevent cancer, viral infections, or inflammatory disorders. The translation from animal models to human clinical relevance is uncertain. This page does not endorse Qing Hao as a treatment for any condition other than noting the established use of artemisinin derivatives in malaria under medical supervision.

Important: All pharmacological effects described above for non-malarial conditions 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: Qing Hao is widely used in TCM practice and is generally considered to have a favorable safety profile when used appropriately at standard doses in formula combinations. 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.

Deficiency-cold patterns: In traditional TCM theory, Qing Hao is bitter, pungent, and cold in nature. Individuals with deficiency-cold patterns — characterized by fear of cold, cold limbs, loose stools, and a pale tongue with white coating — should avoid Qing Hao, as its cold nature may further damage Yang Qi. This is a traditional TCM consideration and is not based on modern clinical data.

Spleen-Stomach deficiency-cold: Individuals with Spleen-Stomach deficiency-cold presenting as poor appetite, abdominal distension, and diarrhea should use Qing Hao with caution or avoid it, as its bitter and cold nature may worsen digestive weakness. In traditional practice, if Qing Hao is needed in such cases, it is combined with warming herbs such as Gan Jiang (dried ginger) or Bai Zhu (Atractylodes) to mitigate its cold properties.

Pregnancy and lactation: Qing Hao is traditionally contraindicated during pregnancy due to its strong cold nature. While artemisinin-based combination therapies are used in the second and third trimesters for malaria under WHO guidelines, the use of whole-herb Qing Hao during pregnancy is not recommended without professional guidance. Self-administration of Qing Hao products during pregnancy is not recommended. Qing Hao should only be used during pregnancy under the direct supervision of a qualified healthcare professional.

Artemisinin drug interactions: Qing Hao contains artemisinin compounds that can interact with many medications. Artemisinin and its derivatives may affect hepatic cytochrome P450 enzyme activity, particularly CYP3A4 and CYP2C19, which could alter the metabolism of many prescription drugs. They may also have additive effects with other antimalarials, hepatotoxic medications, and drugs that prolong the QT interval. The herb may potentially interact with immunosuppressants and anticoagulants. Clinical interaction data for whole-herb Qing Hao are limited. Consult a qualified healthcare professional before combining Qing Hao with any prescription medications.

Spontaneous sweating: Individuals with spontaneous sweating due to Qi deficiency should avoid Qing Hao, as its pungent, dispersing nature may exacerbate fluid loss. In TCM theory, this is considered a basic contraindication for dispersing herbs in Qi deficiency patterns. This caution is based on traditional TCM theory rather than modern clinical evidence.

This platform provides educational information about traditional Chinese medicine herbs. It does not recommend, endorse, or prescribe the use of Qing Hao 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.