Ài Yè (艾叶) — Mugwort leaf / Moxa herb

Ai Ye (Artemisia argyi / Mugwort) is one of the most versatile and important herbs in the entire Chinese pharmacopoeia. It is unique in being used both internally as a herbal medicine and externally as the principal raw material for moxibustion — the technique of burning dried mugwort over acupuncture points to deliver penetrating warmth. Its special affinity for the Liver, Spleen and Kidney channels makes it indispensable in gynaecology, obstetrics and pregnancy — warming the channels, stopping cold-pattern bleeding, dispersing cold and pain, and calming the foetus.

On this page

1. What is Mugwort (Ai Ye)?
2. Properties
3. Actions and indications
4. Active compounds
5. Moxibustion — the principal external use
6. Mugwort and breech baby
7. Mugwort for menstrual disorders
8. Mugwort for threatened miscarriage
9. Anti-inflammatory and antimicrobial uses
10. European folk uses
11. Key Ai Ye formulas
12. Modern research
13. Incompatibilities
14. Cautions and contraindications
15. Treatment at my clinic
16. Frequently asked questions about Mugwort

1. What is Mugwort (Ai Ye)?

Ài Yè (艾叶) is the dried leaf of Artemisia argyi, the Chinese mugwort — closely related to the European species Artemisia vulgaris. The leaves are harvested in late spring to early summer, dried and either used directly as the herb (Ai Ye) for internal medicine, or aged for several years to produce moxa “wool” used in moxibustion. The longer the moxa is aged (3 years, 5 years, 10 years), the higher quality and gentler the heat it produces.

It belongs to the category of Herbs that stop bleeding in the Chinese Materia Medica and is the only herb that crosses straight into European folk medicine — Hildegard of Bingen wrote about it in the twelfth century, and it features in the Anglo-Saxon herbal Lacnunga. I prescribe Ài Yè as part of bespoke herbal formulas from pharmaceutical-grade granules sourced from Sun Ten in Taiwan. Online consultations are available.

2. Properties

3. Actions and indications

Principal actions

1. Warms the channels and stops bleeding — the primary herb for Cold uterine bleeding; for cold-type uterine bleeding and threatened miscarriage from cold and deficiency
2. Disperses Cold and alleviates pain — particularly cold lower abdomen and uterus; the most important herb for cold-type dysmenorrhoea
3. Calms the foetus — uniquely both moves and stabilises in pregnancy contexts under specialist guidance
4. Warms the meridians and is the primary material for moxibustion

Indications

1. Cold uterine bleeding and menorrhagia — the most important herb for bleeding from Cold
2. Dysmenorrhoea from Cold uterus — lower abdominal pain relieved by warmth
3. Recurrent miscarriage and threatened miscarriage from uterine Cold
4. Used externally as moxibustion for warming any Cold condition throughout the body
5. Eczema and itching from Cold-Damp (external wash)
6. Breech presentation (moxa at BL 67)
7. Late, scanty, pale periods from cold uterus

4. Active compounds

• Sesquiterpene lactones — anti-inflammatory and antimicrobial
• Flavonoids (including jaceosidin and eupatilin) — antioxidant and anti-inflammatory
• Essential oil components (cineole, camphor, thujone, borneol) — give the characteristic smoke and aromatic warming action when burned
• Polysaccharides — immune-modulating
• Tannins — astringent; explain the bleeding-stopping action
• Note on artemisinin — the famous antimalarial compound that won Tu Youyou the Nobel Prize in 2015 — is from Artemisia annua (Qing Hao), a different species. Ai Ye doesn’t contain significant artemisinin.

5. Moxibustion — the principal external use

Moxibustion is the burning of dried, aged mugwort over acupuncture points. The penetrating warmth (without quite touching the skin) delivers therapeutic heat that stimulates the point and warms the channels. Three main methods:

• Moxa stick — a cigar-shaped roll of moxa wool held above the point; most common method
• Moxa cone (direct or indirect) — small cones of moxa wool placed on the skin (usually with a barrier of ginger, garlic or salt) and burned down
• Moxa box / smokeless moxa — modern variants for indoor use

Indications:

• Yang deficiency — fatigue, cold extremities, low BBT
• Cold uterus — late, painful, scanty periods relieved by warmth
• Recurrent miscarriage from cold and Kidney Yang deficiency
• Breech baby (BL 67) — see below
• Spleen Yang deficiency — chronic loose stools, poor digestion
• Chronic lower back pain
• Fatigue and immune support

6. Mugwort and breech baby

Moxibustion at BL 67 (Zhi Yin) at the outer corner of the little toe is one of the best-evidenced TCM techniques in obstetrics:

• Cardini and Weixin, JAMA 1998 — landmark RCT; 75% cephalic version with moxa vs 47% control at 35 weeks
• Cochrane systematic review — supports use at 33–37 weeks gestation
• Multiple subsequent RCTs and meta-analyses have replicated the benefit
• Recommended in many UK midwifery-led services
• Best window: 33–35 weeks; up to 37 weeks acceptable
• Self-administered at home with practitioner guidance
• 15–20 minutes per side, once or twice daily for 10 consecutive days

See my full guide on moxibustion for breech baby for detailed home-use instructions.

7. Mugwort for menstrual disorders

Internally, Ai Ye is used for menstrual disorders with cold patterns:

• Cold-type dysmenorrhoea — cramping period pain relieved by warmth, dark clotted flow
• Late, scanty, pale periods from cold uterus
• Cold-type uterine bleeding — usually combined with other blood-stopping herbs
• Cold infertility — combined with Kidney Yang tonics
• Postnatal abdominal pain from cold stasis

Standard dose 3–9g internally in a tailored formula. Often used in Wen Jing Tang and Ai Fu Nuan Gong Wan.

8. Mugwort for threatened miscarriage

Ai Ye is one of the classical “calm the foetus” herbs in TCM. Used selectively in pregnancy under specialist supervision for:

• Threatened miscarriage with bleeding from Kidney Yang deficiency or cold — combined with Xu Duan, Sang Ji Sheng, Du Zhong in Jiao Ai Tang or Tai Shan Pan Shi San
• Recurrent miscarriage with cold uterus pattern — used preconception and in early pregnancy
• Bleeding in early pregnancy from Blood deficiency or cold

This is specialist territory — never self-prescribe in pregnancy. Always under a qualified TCM practitioner with obstetric awareness.

9. Anti-inflammatory and antimicrobial uses

• External application for skin infections, minor wounds
• Sitz baths for haemorrhoids, perineal recovery postpartum
• Foot baths for cold extremities and circulation support
• Steam inhalation in some respiratory protocols
• Herbal pillow for headaches and insomnia (very gentle external use)

10. European folk uses

Mugwort has parallel uses across European traditions:

• Anglo-Saxon medicine — included in the “Nine Herbs Charm” of Lacnunga; one of the principal medicinal plants
• Hildegard of Bingen (12th century) — wrote of its digestive and women’s health uses
• Roman armies — placed mugwort in sandals to relieve foot fatigue on long marches
• European folk birth medicine — used for menstrual regulation and birth support across many traditions
• Lucid dreaming — modern herbal traditions use mugwort tea for vivid dreams (the mild thujone content)
• Insect repellent — burned or hung in dried bunches
• Culinary use — flavouring goose fat (in Germany, hence “Gänsekraut”) and beer (before hops)

11. Key Ai Ye formulas

• Ai Fu Nuan Gong Wan — Mugwort and Cyperus Warm the Palace Pill; classical formula for cold uterus, cold dysmenorrhoea and infertility from cold
• Jiao Ai Tang — Donkey-hide Gelatin and Mugwort Decoction; classical formula for threatened miscarriage with bleeding from Blood deficiency and cold
• Tai Shan Pan Shi San — Powder for Calming the Foetus as Tai Shan Mountain; threatened miscarriage with Kidney and Spleen deficiency
• Wen Jing Tang — Warm the Menses Decoction; Ai Ye is one of the herbs in this principal cold-uterus formula
• Bao Chan Wu You Fang — “Worry-Free Childbirth Formula”; used in late pregnancy
• Sheng Hua Tang — postnatal recovery formula; Ai Ye is sometimes added for cold patterns

See the full Chinese herbal medicine formula directory.

12. Modern research

Artemisia argyi (Ai Ye) is the source material for moxibustion. Key bioactive constituents include volatile oils (cineole, camphor, borneol), flavonoids, polysaccharides and sesquiterpene lactones. Research confirms significant anti-inflammatory effects, uterine smooth muscle-relaxing properties (explaining its role in preventing miscarriage), haemostatic effects via platelet aggregation enhancement, antibacterial and antifungal activity, and immunomodulatory properties. The volatile oil is responsible for much of the therapeutic action in both internal use and moxibustion. Ai Ye is the only herb in the Materia Medica that is also a major external treatment modality.

13. Incompatibilities

Ài Yè (艾叶) Mugwort leaf is not listed in either of the two classical incompatibility texts — Shi Ba Fan (Eighteen Antagonisms) or Shi Jiu Wei (Nineteen Mutual Inhibitions). As with every Chinese herb it should be prescribed only as part of a balanced formula by a registered Chinese herbalist (RCHM).

14. Cautions and contraindications

• Pregnancy — internal use only under specialist supervision. External moxibustion is restricted to specific indications and points (notably BL 67 for breech). Routine warming-uterus moxa is not done in pregnancy.
• Heat patterns or Yin deficiency — Ai Ye is warm; can worsen heat without balancing herbs.
• High-dose internal use is hepatotoxic — the essential oil components can damage the liver. Never use large oral doses outside of professional prescription.
• Allergy to Asteraceae plants (ragweed, daisies, chrysanthemums) — possible cross-reactivity.
• Asthma — moxa smoke can trigger symptoms; use smokeless moxa or ventilate well.
• Burn risk — moxa requires care; never let burning embers fall on skin or fabric. Stop if too hot.
• Smoke ventilation — moxa smoke contains particulates; well-ventilated room essential.
• Anticoagulants — modest interaction possible; tell your prescriber.
• Smoke detectors — moxa smoke triggers many smoke alarms; cover or move temporarily.

Pattern contraindications

Use the correct sub-type for the bleeding pattern — warming forms (e.g. Ai Ye) are for cold-pattern bleeding; cooling forms (e.g. Bai Mao Gen, Han Lian Cao, Ce Bai Ye) are for heat-pattern bleeding. Misapplied, they can worsen the underlying imbalance.

Modern drug interactions

Tell your GP if you are taking anticoagulants or antiplatelet medication. Coordinate dosing with your prescriber.

Important: Chinese herbs should always be prescribed by a fully qualified herbalist who is a member of the Register of Chinese Herbal Medicine (RCHM). Dr (TCM) Attilio D’Alberto is a member of the RCHM and the British Acupuncture Council with over 25 years of clinical experience.

15. Treatment at my clinic

I prescribe Ài Yè as part of tailored herbal formulas for conditions including fertility, irregular menstrual cycle, miscarriage, luteal phase defect and cold dysmenorrhoea. I also use moxibustion clinically and teach home-use for breech presentation. Every prescription is individually formulated following a full TCM assessment.

I see patients in person at my clinic in Wokingham, Berkshire. Online Chinese herbal medicine consultations are available throughout the UK and internationally. Visit the prices page for consultation fees.

Return to the Chinese herb directory or the Chinese herbal medicine main page.

16. Frequently asked questions about Mugwort

What is mugwort used for?

Externally as moxibustion: Yang deficiency, cold uterus, breech baby (at BL 67), chronic lower back pain. Internally: cold-type menstrual disorders, threatened miscarriage from cold and deficiency, cold-uterus infertility.

Is mugwort the same as artemisinin?

No. Artemisinin is from Artemisia annua (Qing Hao), a different species. Ai Ye doesn’t contain significant artemisinin.

Can I use moxibustion at home?

Yes for many indications including BL 67 for breech baby, with practitioner guidance. Use a moxa stick held about 2cm from the skin for 15–20 minutes per session. Ventilate the room. Cover smoke detectors.

Is mugwort safe in pregnancy?

Internal use only under specialist supervision. External moxibustion is used for specific indications (notably BL 67 for breech) but routine warming moxa is not done in pregnancy.

Will moxibustion really turn my breech baby?

Cardini’s 1998 RCT in JAMA showed 75% cephalic version with moxa vs 47% control at 35 weeks. Cochrane review supports use at 33–37 weeks. It significantly improves the odds; doesn’t guarantee.

Is mugwort smoke harmful?

Mild and brief exposure is generally safe but the smoke contains particulates. Use a well-ventilated room, smokeless moxa for sensitive individuals, and don’t use long-term in confined spaces. Asthmatics should use smokeless variants.

Can I drink mugwort tea?

Mild use in non-pregnant adults is generally safe. Don’t take large or long-term doses; high doses can be hepatotoxic. Don’t take in pregnancy without practitioner guidance.