Shengdi and Shudi are mainly referred to as raw and ripe groundnuts in Chinese medicine. Raw and rehmannia are different and very different in terms of their normalization, properties and effects. Although they are found in many prescriptions, the roles they play are different. Raw is a drug that clears heat and cools the blood, nourishes yin and generates fluids, the effect is such that, for example, there is deficiency heat, dry heat or the need to add heat and cool the blood inside the formula, you can choose to use raw earth, danpi and other drugs that clear heat and cool the blood. The main purpose of the Radix Rehmanniae is to tonify the kidney and fill the essence. In the Six Flavors Dihuang Pill, you can see that Shu Di is found in Zuo Gui Pill and Right Gui Pill, which tonify kidney yin and kidney yang, and regulate kidney essence.