Qing Hao (Wormwood)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Qing Hao, and why is it not decocted long?

  Roughly 3–10 g in decoction (Chen & Chen give 3–10 g; Bensky gives a slightly narrower 3–9 g), consistent with the Sacred Lotus reference range. Qing Hao should be added near the end of a decoction and not boiled for long — classical instruction (going back at least to the 4th-century physician Ge Hong, who directed soaking the fresh herb in water and wringing out the juice rather than boiling it) holds that overcooking reduces its effectiveness. This matches the modern chemical understanding that its key active constituents, including artemisinin, are heat-labile and can degrade with prolonged high-heat decoction.

  Source: Sacred Lotus sources & references; cross-referenced against multiple online sources and standard materia medica ranges; historical preparation method described in Tu Youyou's 2015 Nobel Lecture (PMID 27488942). Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Qing Hao?

  Overcooking is the main practical caution — prolonged decoction is traditionally understood to reduce Qing Hao's effectiveness, so it is typically added toward the end of the decoction process. As a cold, Liver/Gallbladder-and-Kidney-channel herb, it is generally used with the same general care as other cooling herbs in patients with pronounced Spleen/Stomach-cold or diarrhea from cold-deficiency, though the Sacred Lotus reference and standard materia medica do not list a specific additional contraindication beyond the overcooking caution.

  Source: Sacred Lotus sources & references; cross-referenced against multiple online sources and materia medica consensus. Reference only, not a substitute for individualized practitioner guidance.

Chinese Herb Toxicity & Overdose

• None significant noted at standard traditional decoction doses. The isolated pharmaceutical compound artemisinin and its semisynthetic derivatives (used as regulated antimalarial drugs, discussed below) have their own separate, well-studied clinical safety profile at pharmaceutical doses; that drug-safety data applies to the purified compound and its derivatives, not to the crude decocted herb, and should not be conflated with traditional Qing Hao use.

  Source: Sacred Lotus sources & references; materia medica consensus. Reference note, not a safety guarantee.

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Qing Hao (Artemisia annua) — including artemisinin and malaria?

  Yes — Qing Hao is the source plant of artemisinin, whose discovery earned the 2015 Nobel Prize in Physiology or Medicine, one of the most significant modern scientific validations to emerge from classical Chinese medicine. It is important to distinguish the isolated pharmaceutical compound and its derivatives from the traditional crude herb: this is a story about a compound found in and inspired by the plant, not evidence that the traditional decoction itself treats malaria.

  • Discovery and history — in her 2015 Nobel Lecture, Youyou Tu describes how a 1970s Chinese research program (Project 523) screened traditional remedies against malaria, and how a passage in Ge Hong's 4th-century handbook Zhouhou Beiji Fang — instructing that Qing Hao be soaked in water and its juice wrung out, rather than boiled — led her team to switch to a low-temperature extraction method that successfully isolated artemisinin, the active antimalarial compound, from the plant.
  • What artemisinin and ACTs are — artemisinin and its semisynthetic derivatives (e.g., artesunate, artemether) are purified/modified pharmaceutical compounds, typically combined with a partner drug as artemisinin-based combination therapies (ACTs); these are regulated antimalarial medicines developed FROM the plant, not the traditional whole-herb decoction, and their use and dosing are a matter for conventional medical/pharmaceutical guidance, not traditional herbal prescribing.
  • Ongoing resistance concerns — ACTs remain a global first-line malaria treatment, but partial resistance to artemisinin in Plasmodium falciparum has been documented and mapped across parts of Africa and Southeast Asia in recent years, an active area of surveillance and research for the pharmaceutical drug — a separate issue from any traditional herbal use of Qing Hao.
  • Broader compound research — beyond malaria, artemisinin and related Artemisia compounds have been studied preclinically for anti-inflammatory and immune-modulating activity (including autoimmune-disease models) and other applications; this is early-stage laboratory/animal research on isolated compounds, not established treatment.

  In short: the Nobel-winning discovery concerns artemisinin, a compound isolated from Qing Hao using a method inspired by a classical preparation instruction — a genuine and well-documented scientific achievement — but it is a statement about a pharmaceutical drug derived from the plant, not a medical claim about the traditional herb or decoction, which continues to be used in TCM for its traditional heat-clearing indications above.

  Sources: PMID 27488942 (Youyou Tu, "Artemisinin—A Gift from Traditional Chinese Medicine to the World," Nobel Lecture, Angew Chem Int Ed Engl, 2016); PMID 42413528 (mapping of P. falciparum artemisinin partial-resistance markers, Lancet Infect Dis); PMID 38054758 (review of artemisinins in autoimmune disease models, preclinical). Research/historical context, not a treatment claim for Qing Hao or a substitute for licensed antimalarial medicine.

Chinese Herb Notes

• What is the difference between Qing Hao and other heat-clearing/deficiency-heat herbs?

  Qing Hao's defining trait among heat-clearing herbs is that it treats deficiency-heat and lurking heat without the drying, Yin-damaging side effect common to many bitter-cold substances — making it a preferred choice specifically when heat and underlying deficiency coexist, rather than for robust excess-heat/Qi-level fever (which calls for herbs like Shi Gao instead).

  Key formula — Qing Hao Bie Jia Tang (Artemisia Annua and Soft-Shelled Turtle Shell Decoction): the signature formula built around Qing Hao, pairing it with Bie Jia (turtle shell) — Qing Hao vents heat outward from the deeper Yin level while Bie Jia nourishes Yin and draws the heat out from within, together treating low-grade nighttime fever, a red tongue with little coating, and a fine, rapid pulse from lingering heat in a Yin-deficient patient (a classic late-stage febrile-disease or chronic Yin-deficiency pattern).

  • Qing Gu San — combines Qing Hao with other Yin-nourishing, bone-steaming-fever herbs for more pronounced "steaming bone" deficiency-heat.
  • Hao Qin Qing Dan Tang — pairs Qing Hao with Huang Qin to clear Gallbladder heat with a damp-heat component, for alternating fever and chills with nausea and a bitter taste.

  Source: Sacred Lotus sources & references (formula links); cross-referenced against multiple online sources and materia medica consensus.