Donkey Hide Gelatin Classic Formulas

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Tonifies blood and enriches deficiency - E Jiao is a major blood tonic used for pallor, dizziness, palpitations, and chronic weakness when blood depletion is central.
Stops bleeding while also nourishing - it is classically used for uterine bleeding, spotting, hemoptysis, and other bleeding patterns where deficiency and dryness are involved rather than blazing excess heat alone.
Nourishes Yin and moistens the Lung - traditional use extends to dry cough, dry throat, irritative cough, and blood-streaked sputum from dryness or deficiency heat.
Calms irritability from deficiency - by enriching blood and Yin, E Jiao is also used when restlessness or insomnia reflects depletion rather than excess obstruction.

Jiao Ai Tang - classic formula for uterine bleeding and threatened fetal instability in which E Jiao nourishes blood while helping stop bleeding.
Huang Lian E Jiao Tang - from Shang Han Lun, using E Jiao to nourish Yin and blood while clearing Heart-Kidney irritability with insomnia and restlessness.
Qing Zao Jiu Fei Tang - includes E Jiao to moisten the Lung and relieve dry cough from autumn dryness or chronic fluid damage.

Traditional materia medica consistently class E Jiao as sweet and neutral, entering the Lung, Liver, and Kidney to tonify blood, stop bleeding, nourish Yin, and moisten dryness.
Its dual role of stopping bleeding without strongly drying and enriching blood without being sharply moving explains why E Jiao is so prominent in gynecologic and deficiency-dryness formulas.