Botanical Overview
Isatis tinctoria and Isatis indigotica (Brassicaceae) are closely related species commonly known as Woad or Chinese woad. Traditionally, their roots (radix) and leaves (folia) are used medicinally. The plant is native to Europe and Asia, notably China, and has historical use as a source of blue dye and medicinal herb.
Energetics
These herbs have a cooling temperature with moistening properties. They taste bitter and pungent and exhibit a descending directionality. The tonicity is generally relaxing, acting on the qi aspect in traditional herbal energetics.
Primary Actions
- Anti-viral
- Anti-inflammatory
- Detoxifying
- Antibacterial
Indications
Western
- Fever
- Sore throat
- Skin inflammation
- Upper respiratory infections
Syndromes
- Acute infections
- Detoxification support
- Inflammatory skin conditions
TCM
- Febrile disease
- Sore throat
- Carbuncles
- Furuncles
Syndromes
- Wind-heat syndrome
- Toxic heat in the lung and throat
- Skin heat and swelling
Ayurveda
No well-supported traditional uses documented.
Unani
No well-supported traditional uses documented.
Constituents & Mechanisms
Key phytochemicals include indirubin, indigo, indirubin-3′-monoxime, various alkaloids, flavonoids, glucosinolates, and organic acids. These compounds contribute to its antiviral and anti-inflammatory effects.
Dosage & Preparations
- Decoction of root: 3-9 g daily
- Leaf infusion: 2-5 g daily
- Extracts standardized for indirubin or indirubin-3′-monoxime
Safety & Contraindications
Generally well tolerated. Avoid use during pregnancy and lactation due to insufficient safety data. May cause allergic reactions in sensitive individuals and should be used cautiously in patients with known Brassicaceae allergies.
Astrological Correspondences
No reliable sources found for planetary or elemental rulers.
Selected References
- World Health Organization Monographs on Selected Medicinal Plants (2007)
- Antiviral and anti-inflammatory activity of Isatis indigotica extracts (Phytotherapy Research, 2007)
- Chinese Herbal Medicine: Materia Medica by T.T. Chen (1995)
- European Medicines Agency Assessment Report (2016)