E Jiao (Colla Corii Asini): TCM's Premier Blood-Nourishing Herb

What is E Jiao?

E Jiao (阿胶), also known as Colla Corii Asini or donkey-hide gelatin, is one of the most treasured substances in Traditional Chinese Medicine. Made by processing and concentrating the gelatin from donkey hide, E Jiao has been used for over 2,000 years as a premier Blood-nourishing tonic.

The name “E Jiao” comes from its origins — it was traditionally produced in Dong’e County (东阿县) in Shandong Province, where the local well water was believed to produce the highest quality gelatin. The character 阿 (E) refers to this region, while 胶 (Jiao) means “gelatin” or “glue.”

In TCM, E Jiao holds a unique status as both a medicinal substance and a wellness tonic, often gifted to elders and new mothers for its Blood-building properties.

Properties and Channel Entry

Property	Description
Chinese name	阿胶 (Ā Jiāo)
English name	Donkey-hide Gelatin, Colla Corii Asini
Nature	Neutral (平)
Taste	Sweet (甘)
Channel entry	Lung (肺), Liver (肝), Kidney (肾)
Dosage	3–9 g (melted in warm water or wine)
Preparation	Stir-baked with oyster shell powder or Pueraria powder

Functions and Clinical Applications

Nourishes Blood (补血)

E Jiao is considered one of the most effective Blood-nourishing herbs in the entire TCM pharmacopoeia. It directly supplements Blood and is used for:

Anemia — pale complexion, dizziness, fatigue
Postpartum Blood deficiency — weakness after childbirth
Menstrual irregularity — scanty periods or amenorrhea due to Blood deficiency
Chronic Blood loss — from ulcers, heavy menstruation, or surgery

Stops Bleeding (止血)

E Jiao has a unique dual action: it nourishes Blood while also stopping bleeding. This makes it invaluable for conditions where Blood is both deficient and leaking:

Hemoptysis (coughing up blood)
Epistaxis (nosebleeds)
Blood in the urine or stool
Uterine bleeding and menorrhagia
Thrombocytopenia (low platelet count)

Nourishes Yin and Moistens the Lungs (滋阴润肺)

E Jiao’s moistening quality makes it useful for:

Dry cough — especially chronic, unproductive cough
Hemoptysis — coughing with blood streaks
Yin deficiency — night sweats, dry mouth, five-center heat

Pregnancy Support

E Jiao is commonly prescribed during pregnancy to:

Prevent threatened miscarriage in women with Blood deficiency
Support healthy fetal development
Build Blood reserves for labor and delivery

Common Formulas Containing E Jiao

Formula	Chinese Name	Primary Use
Jiao Ai Tang	胶艾汤	Uterine bleeding during pregnancy
Zhi Gan Cao Tang	炙甘草汤	Arrhythmia, Heart Yin deficiency
Huang Tu Tang	黄土汤	GI bleeding, Spleen not holding Blood
Bu Fei E Jiao Tang	补肺阿胶汤	Lung Yin deficiency with dry cough
Qing Zao Jiu Fei Tang	清燥救肺汤	Dry-Heat damaging the Lungs

How E Jiao Is Used

Traditional Preparation

E Jiao comes as hard, dark gelatin blocks
It must be melted before use — either dissolved in warm water, rice wine, or the hot decoction of other herbs
Never boil E Jiao directly with other herbs — it will stick to the pot and burn
The traditional method: crush into small pieces, add to warm liquid, stir until dissolved

Modern Formats

E Jiao powder — easier to dissolve
E Jiao cakes/bars (阿胶糕) — pre-made with nuts, dates, and sesame; popular as daily supplements
E Jiao oral liquid — convenient pre-dissolved format

Modern Research

Contemporary studies have investigated E Jiao’s pharmacological effects:

Area of Research	Findings
Hematology	Increases red blood cell and hemoglobin counts in animal models
Immunology	Enhances immune cell activity and antibody production
Bone health	May help prevent osteoporosis by supporting calcium metabolism
Anti-aging	Antioxidant properties observed in laboratory studies
Coagulation	Contains components that support normal blood clotting

Precautions and Contraindications

Spleen deficiency with Dampness: E Jiao’s cloying nature can worsen bloating, loose stools, and nausea — combine with Spleen-strengthening herbs if needed
Early-stage external pathogenic conditions: Avoid — its tonifying nature can “trap” pathogens
Digestive weakness: Start with small doses and monitor tolerance
Quality matters: Authentic Dong’e E Jiao is expensive; adulterated products exist on the market

Key Takeaways

E Jiao is TCM’s most potent Blood-nourishing herb, with over 2,000 years of use
It simultaneously nourishes Blood and stops bleeding — a rare dual action
It also moistens the Lungs and supports Yin, making it useful for dry cough
Common applications include anemia, postpartum recovery, and pregnancy support
Its cloying nature means it should be used carefully in those with weak digestion

Disclaimer: This article is for educational purposes only. E Jiao should only be used under the guidance of a qualified healthcare professional, especially during pregnancy.