Chicken Gizzard Lining Classic Formulas

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Promotes digestion and resolves food stagnation - Ji Nei Jin is a leading digestive aid for stubborn accumulation from grains, starches, dairy, and meat, especially when bloating, poor appetite, nausea, or childhood malnutrition accompany retained food.
Strengthens the Spleen while dispersing accumulation - unlike purely draining digestants, it is used when weak digestive transformation and retained food coexist, such as chronic poor appetite with loose stools and post-illness digestive sluggishness.
Secures essence and stops enuresis - its astringing lower-burner action makes it useful for bedwetting, frequent urination, and seminal emission patterns when Spleen weakness contributes to insecure Kidney-Bladder function.
Softens hardness and dissolves urinary or biliary stones - the raw powdered form is traditionally favored for urinary gravel, small stones, and stubborn mineral accumulation, often paired with Jin Qian Cao or Hai Jin Sha.

Yi Pi Bing (益脾饼) - Zhang Xichun's Spleen-benefiting cake pairing Ji Nei Jin with Bai Zhu to strengthen weak digestion while dispersing food retention and pediatric malnutrition patterns.
San Jin Tang (三金汤) - stone-dissolving formula pattern based on Ji Nei Jin with Jin Qian Cao and related damp-heat-clearing ingredients for urinary or biliary calculi.
Ji Pi Zi San (鸡脾子散) - classical pattern using Ji Nei Jin with Sang Piao Xiao and related ingredients for bedwetting, frequent urination, and seminal leakage due to insecure lower-burner function.

Me and Qi describes Ji Nei Jin as the dried inner lining of the chicken gizzard, sweet and neutral, entering the Spleen, Stomach, Small Intestine, and Bladder channels, with key actions of promoting digestion, strengthening the Spleen, securing essence, and dissolving stones.
The same source notes that Ji Nei Jin is significantly more effective when taken as powder, that the raw form is preferred for stone disorders, and that the stir-fried form is preferred for diarrhea, poor appetite, and enuresis.
Traditional comparisons place Ji Nei Jin above Mai Ya or Shan Zha when food stagnation is severe or chronic and when stone dissolution or lower-burner astringing are also required.