Eden Apothecary · Herb Profile
Artemisia capillaris
Also known as Yin Chen, Yin Chen Hao
Pronounced Capillaris Wormwood: kap-ih-LAIR-iss WURM-wood. Artemisia capillaris: ar-teh-MEE-zhee-uh kap-ih-LAIR-iss. Yin Chen Hao: yin chun how.
Cool and drying: a bitter, aromatic spring shoot that drains damp-heat from the liver and gallbladder, opens bile flow, and resolves the yellow of damp-heat (yang) jaundice.
Insufficient reliable modern human data; avoid in pregnancy for self-care and use only under qualified professional supervision for a genuine damp-heat pattern. Yin Chen Hao is a bitter, cool, draining herb, and consumer and clinical references advise against use in pregnancy and nursing given the absence of adequate safety data. It is a distinct species from the thujone-rich abortifacient wormwood (Artemisia absinthium) and mugwort (Artemisia vulgaris) and is not a recognized emmenagogue, but its scoparone and chromone constituents strongly induce hepatic drug-metabolizing enzymes (CAR-mediated CYP and UGT induction), which is an additional reason to avoid casual use in pregnancy. Modern references (Bensky, Clavey and Stoger, Chinese Herbal Medicine: Materia Medica, 3rd ed.; Chen and Chen, Chinese Medical Herbology and Pharmacology) restrict bitter-cold damp-heat drainers in pregnancy to short-course, practitioner-prescribed use. AHPA Botanical Safety Handbook interaction/pregnancy class to be confirmed at merge.
Caution; limited data. There is little modern data on the transfer of Yin Chen constituents into breast milk, and its cool, draining nature could disturb an infant's digestion, so prolonged or high-dose maternal use should be avoided during lactation. Its enzyme-inducing coumarins (CAR-mediated CYP/UGT induction) are a theoretical concern for an exposed infant's drug and bilirubin metabolism. Short low-dose courses within a balanced formula under professional supervision are the outer limit of prudent use; prefer better-studied, gentler alternatives while nursing (Chen and Chen; Bensky, Clavey and Stoger).
Only under qualified supervision. Notably, the closely related classical preparation Yin Zhi Huang (a decoction built on Artemisia capillaris) is used clinically in East Asia for neonatal jaundice, and its mechanism is documented: 6,7-dimethylesculetin activates the nuclear receptor CAR and induces bilirubin glucuronyl transferase (UGT1A1), accelerating bilirubin clearance (Huang et al., J Clin Invest 2004). This is a supervised medical use, not a license for casual pediatric dosing. Neonatal and infant jaundice must be medically managed, never self-treated. The bitter-cool nature readily chills a child's digestion, and the same enzyme induction alters the metabolism of any co-administered pediatric medication (Chen and Chen; Bensky, Clavey and Stoger; Huang et al. 2004).
Bitter, cool, and drying, so even short courses can chill and slow a weak digestion, bringing loose stools and poor appetite; it is best reserved for genuine damp-heat and combined with digestive-protective herbs in cold-prone people. Doses of 15 g or more have been associated in consumer reports with numbness, tremor, irregular heartbeat, dizziness, and fainting, so keep to customary amounts. As an Asteraceae (Compositae) herb it can provoke allergic dermatitis or cross-reactivity in ragweed-sensitive individuals. Most important, its coumarin constituent 6,7-dimethylesculetin (scoparone) activates the nuclear receptor CAR and induces hepatic drug-metabolizing enzymes (CYP3A, CYP2B, CYP2C19, UGT1A1), so it can accelerate the clearance and lower the blood levels of many co-administered medicines (see Drug Interactions). Jaundice must be medically diagnosed before any self-treatment.
Non-damp-heat jaundice (cold-damp yin jaundice, or deficiency-type sallowness from blood or qi deficiency). Spleen and Stomach deficiency-cold and Kidney yang deficiency (TCM). Frank yin or blood deficiency with dryness. Pregnancy and lactation except under qualified professional supervision (see safety fields). Concurrent use of narrow-therapeutic-index medications metabolized by CYP3A4, CYP2C19, CYP2B6, or UGT1A1 without professional oversight, given the enzyme-induction interactions. Known Asteraceae/Compositae allergy.
Not at risk. Artemisia capillaris is an abundant, weedy, fast-colonizing perennial widely distributed and commercially cultivated and wild-collected across East Asia, and the medicinal portion is only the renewable spring shoot, so it is a low-pressure, sustainable resource. Prefer cultivated or responsibly wild-harvested young shoots. Not listed by United Plant Savers (a North American native-plant registry; this is an Asian species).
Not in canonical biblical texts and unknown to the ancient Mediterranean world; native to East Asia (China, Korea, Japan, and the Russian Far East). Its documented tradition is Chinese: the young shoot entered the materia medica in the Han-era Shen Nong Ben Cao Jing as Yin Chen Hao and runs through every later Chinese pharmacopoeia as the premier herb to clear damp-heat and resolve jaundice. It is distinct from the biblical 'wormwood' (la'anah) of Scripture, which refers to bitter Near Eastern Artemisia such as Artemisia herba-alba or Artemisia judaica, not this East Asian species.
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