Fresh Egg Yolk Classic Formulas — Natural Herb Library

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Nourishes Yin and moistens dryness - Ji Zi Huang is used when prolonged illness or febrile damage has depleted fluids and left vexation, dryness, or weakness.
Nourishes blood and extinguishes internal wind - classical use includes tremor, spasm, or agitation when severe Yin-Blood depletion fails to anchor the sinews and spirit.
Harmonizes the middle and settles deficiency-type nausea or vomiting - it is an animal-food medicinal used more as a restorative adjunct than as a standard dried herb.
Gently clears deficiency heat and calms insomnia or restlessness in Heart-Kidney Yin deficiency.

Huang Lian E Jiao Tang - iconic formula for Shao Yin heat-transformation insomnia in which Ji Zi Huang nourishes Heart-Kidney Yin.
Da Ding Feng Zhu - severe Yin-depletion and internal-wind formula where egg yolk acts as a core Wind-stabilizing nourisher.
Bai He Ji Zi Huang Tang - classical formula using egg yolk to address post-vomiting injury and Bai He disorder patterns.

Me and Qi describes Ji Zi Huang as a neutral, sweet, Yin-nourishing animal medicinal that enters the Heart, Kidneys, and Spleen.
Classical formula history connects Ji Zi Huang especially with Huang Lian E Jiao Tang and Da Ding Feng Zhu for severe depletion, insomnia, and internal wind.