Hearth Center Earth Classic Formulas

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Warms the middle and stops vomiting - Zao Xin Tu is classically used for nausea, retching, and chronic vomiting when Stomach cold or middle-burner deficiency is the root pattern.
Warms the intestines and stops diarrhea - it is chosen for chronic diarrhea and loose stools arising from Spleen-Stomach deficiency cold rather than from damp-heat or infectious excess.
Warms blood and arrests bleeding - classical use extends to hematemesis, hemafecia, uterine bleeding, and other bleeding patterns in which cold and deficiency impair the middle burner's ability to hold blood.

Huang Tu Tang - the defining classical formula for bleeding due to Spleen deficiency cold.
Traditional pregnancy-vomiting combinations pair Zao Xin Tu with Sheng Jiang, Zhu Ru, or Zi Su Geng when cold and rebellious Stomach Qi are both present.
Cold-deficiency diarrhea combinations pair it with Bai Zhu, Gan Jiang, Sha Ren, or Ren Shen to stabilize the middle while stopping leakage.

Classical herbology presents Zao Xin Tu or Fu Long Gan as a hearth-derived earth that warms the middle, stops vomiting, and arrests bleeding.
Its use depends on distinguishing cold-type bleeding from heat-type bleeding; the same herb is considered wrong when bleeding arises from Yin deficiency heat or replete heat.
Older texts also note its external use for certain sores and blisters, but its main identity remains internal warming and astringing.