How many types of Rehmannia丸 (Rehmannia-based pills) are there?

Rehmannia丸, as a traditional Chinese medicine preparation, can be categorized into various types according to different formulations and uses. Common types of Rehmannia丸 mainly include: 1. **Liu Wei Di Huang Wan**: Composed of ingredients such as Cornus officinalis, Chinese yam, and Poria, this formula nourishes yin and supplements the kidney. 2. **Qi Ju Di Huang Wan**: Based on Liu Wei Di Huang Wan, with the addition of Lycium barbarum and Chrysanthemum, it is suitable for nourishing the kidney and liver to improve vision. 3. **Mai Wei Di Huang Wan**: Based on Liu Wei Di Huang Wan, with the addition of Ophiopogon japonicus and Schisandra chinensis, it is suitable for nourishing the kidney and lung. 4. **Gui Fu Di Huang Wan**: Based on Liu Wei Di Huang Wan, with the addition of Cinnamon and Aconite, it warms and supplements kidney yang. 5. **Zhi Bai Di Huang Wan**: Based on Liu Wei Di Huang Wan, with the addition of Anemarrhena and Phellodendron, it primarily nourishes yin and reduces internal heat. 6. **Others**: There are also Qing Re Di Huang Wan (clearing heat Rehmannia丸), Ming Mu Di Huang Wan (vision-improving Rehmannia丸), and Bu Yi Di Huang Wan (tonifying Rehmannia丸), each with unique therapeutic effects and indications. Due to the wide variety of Rehmannia丸, selection should be based on individual medical conditions and guided by a physician's recommendations.