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Indigo, Qing Dai 青黛

Pigmentum Indicum
Qing Dai (TCM)

Picture
The processing of Indigo
(Museum Museorum, Valentini, 1704)

Picture
Indigofera tinctoria
Ausländische Culturpflanzen in bunten Wand-Tafeln
, (?)

Picture
A Block of Indian Indigo
(Photo by Palladian) (Wikimedia)

Botanical name:
Several plants supply Indigo:
  1. Baphicacanthus cusia
  2. Polygonum tinctorium
  3. Isatis indigotica (syn Isatis tinctoria)
  4. Indigofera tinctoria, I. anil, I. argentea

Parts used:
Indigo extracted from any of the above plants

Temperature & Taste:
Cold, dry. Salty

Classification:
B. Clears Heat and Toxin

Uses:
1. Clears Heat and Poison, Cools the Blood:
-rashes and spots from hot toxin
-'epidemic disease with headache, chills and fever'. (Kai Bao Ben Cao)
-Bleeding from excess Heat
-swelling, pain and redness of the mouth or throat; Mumps
-traditionally used for the poison of Snakes or Rabid Dogs.
-'quickly assuages swellings and inflammations'. (Galen)
-detoxifies the toxin of various drugs (Ben Cao Gang Mu)


2. Clears Liver Heat, Settles Wind to Stop Tremors:
-red eyes, restlessness, sore throat, Fever with Convulsions

3. Clears Lung Heat:
-Cough, Bronchitis and Chest pain from Lung heat

4. Externally:
-topically for red, itchy skin conditions such as Eczema
-topically for mouth or throat sores and ulcers
-topically for red, painful swellings and sores, Carbuncles, Abscesses


DOSE:
1–3 grams in pills or powders. Pills can be coated with Indigo; it can be taken in powders or pills, or dissolved into strained decoctions; it can be used topically.

COMMENT:
Indigo is a concentrated extract of cooling plants used to clear Heat and Poison. The purple powder was traditionally used as a dye and for early tattoo-making. It is very Cold, dry and Salty. It clears Heat from the Blood, Throat, Lungs and Liver in particular. It is also useful for strong heat causing Febrile Convulsions and can be used topically to clear Heat and Poison.

Main Combinations:
1. Heat of the Blood with red spots and rashes and fever, with Rehmannia Sheng Di Huang and Gypsum Shi Gao
2. Febrile convulsions in children, with Gastrodia Tian Ma and Bezoar
3. Heat with mouth or throat sores, red eyes, with Talcum and Licorice
4. Strong Liver Fire with restlessness and convulsions, with Genitana Long Dan Cao and Coptis Huang Lian
5. Spitting Blood, Clam shell (Ge Ke) (10 parts), Indigo (Qing Dai) (1 part). Form a powder (as in Dai Ge San from Wei Sheng Hong Bao [A Great Precious Sanitation])
6. Mouth sores or ulcers that don't heal, topically with Borneol Camphor and Alum
7. Sore Throat, Stomatitis, Gingivitis, Indigo, Coptis Huang Lian, Phellodendron Huang Bai, Mint (Bo He), Platycodon Jie Geng, Catechu (Er Cha)
8. Carbuncle, Abscess, Indigo, Rhubarb, powder, mix with egg white and apply. (Ben Cao Gang Mu)
9. Hot, itchy, painful Sores, beat Purslane to a paste, mix in Indigo and apply. (Ben Cao Gang Mu)

Cautions:
1. Use cautiously in people with Stomach Coldness
2. Use cautiously in patients with Ulcerative Colitis as research has shown a percentage of side effects in these patients.

Main Preparations used:


Research
GENERAL / REVIEW
–From natural dye to herbal medicine: a systematic review of chemical constituents, pharmacological effects and clinical applications of indigo naturalis
–A Comprehensive Review of the Chemistry, Pharmacokinetics, Pharmacology, Clinical Applications, Adverse Events, and Quality Control of Indigo Naturalis
–Isatis tinctoria L. (Woad): A Review of Its Botany, Ethnobotanical Uses, Phytochemistry, Biological Activities, and Biotechnological Studies

ANTI-BACTERIAL
–From natural dye to herbal medicine: a systematic review of chemical constituents, pharmacological effects and clinical applications of indigo naturalis
–An In Vitro Study of the Antimicrobial Effects of Indigo Naturalis Prepared from Strobilanthes formosanus Moore

ANTI-VIRAL
–From natural dye to herbal medicine: a systematic review of chemical constituents, pharmacological effects and clinical applications of indigo naturalis

VIRAL-INDUCED LUNG INJURY
–Beneficial effect of Indigo Naturalis on acute lung injury induced by influenza A virus

ANTI-OXIDANT
–From natural dye to herbal medicine: a systematic review of chemical constituents, pharmacological effects and clinical applications of indigo naturalis

ANTI-INFLAMMATORY
–From natural dye to herbal medicine: a systematic review of chemical constituents, pharmacological effects and clinical applications of indigo naturalis
–Qing-dai powder promotes recovery of colitis by inhibiting inflammatory responses of colonic macrophages in dextran sulfate sodium-treated mice

IMMUNOMODULATORY
–From natural dye to herbal medicine: a systematic review of chemical constituents, pharmacological effects and clinical applications of indigo naturalis

PSORIASIS
–Anti-psoriatic effects of indigo naturalis on the proliferation and differentiation of keratinocytes with indirubin as the active component.
–Clinical assessment of patients with recalcitrant psoriasis in a randomized, observer-blind, vehicle-controlled trial using indigo naturalis.
–Comparison of indirubin concentrations in indigo naturalis ointment for psoriasis treatment: a randomized, double-blind, dosage-controlled trial.
–
Indirubin ameliorates imiquimod-induced psoriasis-like skin lesions in mice by inhibiting inflammatory responses mediated by IL-17A-producing γδ T cells.
–Clinical efficacy and IL-17 targeting mechanism of Indigo naturalis as a topical agent in moderate psoriasis
–A Comprehensive Review of the Chemistry, Pharmacokinetics, Pharmacology, Clinical Applications, Adverse Events, and Quality Control of Indigo Naturalis

ANTI-TUMOR / ANTI-CANCER
–From natural dye to herbal medicine: a systematic review of chemical constituents, pharmacological effects and clinical applications of indigo naturalis
–Enhancing effects of indirubin on the arsenic disulfide-induced apoptosis of human diffuse large B-cell lymphoma cells.
–Antitumor activity of novel indirubin derivatives in rat tumor model.
–Review Molecular mechanisms of indirubin and its derivatives: novel anticancer molecules with their origin in traditional Chinese phytomedicine.
–Indirubin enhances tumor necrosis factor-induced apoptosis through modulation of nuclear factor-kappa B signaling pathway
–A Comprehensive Review of the Chemistry, Pharmacokinetics, Pharmacology, Clinical Applications, Adverse Events, and Quality Control of Indigo Naturalis

LEUKEMIA
–Dissection of mechanisms of Chinese medicinal formula Realgar-Indigo naturalis as an effective treatment for promyelocytic leukemia.
–Multicenter randomized trial of arsenic trioxide and Realgar-Indigo naturalis formula in pediatric patients with acute promyelocytic leukemia: Interim results of the SCCLG-APL clinical study.

ANTI-ANGIOGENIC
–Indigo naturalis and its component tryptanthrin exert anti-angiogenic effect by arresting cell cycle and inhibiting Akt and FAK signaling in human vascular endothelial cells.
–A Comprehensive Review of the Chemistry, Pharmacokinetics, Pharmacology, Clinical Applications, Adverse Events, and Quality Control of Indigo Naturalis

COLITIS
–Qing-dai powder promotes recovery of colitis by inhibiting inflammatory responses of colonic macrophages in dextran sulfate sodium-treated mice

ULCERATIVE COLITIS
–Indirubin ameliorates dextran sulfate sodium-induced ulcerative colitis in mice through the inhibition of inflammation and the induction of Foxp3-expressing regulatory T cells
–The combination of indirubin and isatin attenuates dextran sodium sulfate induced ulcerative colitis in mice.
–Efficacy and safety of short-term therapy with indigo naturalis for ulcerative colitis: An investigator-initiated multicenter double-blind clinical trial
–Efficacy of Indigo Naturalis Therapy for Ulcerative Colitis: A Case Series

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