Fresh Rehmannia Root Classic Formulas

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Clears heat and cools the blood - Sheng Di Huang is central to febrile disease patterns with crimson tongue, irritability, heat entering the nutritive-blood level, and blood-heat bleeding.
Nourishes Yin and generates fluids - it is used for thirst, dry mouth, deficiency heat, and residual dryness after warm disease or chronic depletion.
Stops bleeding from blood heat - traditional indications include nosebleed, uterine bleeding, hemoptysis, and rash or macules when heat agitates the blood.
Moistens dryness and benefits the bowels - it is added when heat and Yin damage lead to dry constipation.

Qing Ying Tang - nutritive-level heat formula using Sheng Di Huang to cool blood while protecting Yin.
Qing Wei San - Stomach-fire and bleeding-gum formula in which Sheng Di Huang cools the blood and nourishes Yin.
Bai He Di Huang Tang - classical formula pairing Bai He with fresh Sheng Di Huang juice for post-febrile Yin-deficiency agitation.
Zhi Gan Cao Tang - pulse-restoring formula that uses Sheng Di Huang to enrich Yin and blood.

TCM Wiki describes Di Huang as sweet, bitter, and cold, entering the Heart, Liver, Stomach, and Kidney to clear heat, cool blood, stop bleeding, and nourish Yin.
Traditional formula literature repeatedly places Sheng Di Huang in blood-heat bleeding, warm-disease, and Stomach-Yin depletion patterns.