Pungent, sweet and hot
Kidney, spleen, heart and liver
1. To tonify the kidneys; 2. To dispel cold and stop pain;3. To warm the channels and promote circulation
1. Kidney yang deficiency manifested as cold limbs, soreness and weakness of the lumbar region and knees, impotence, spermatorrhea and frequent urination. Cinnamon bark (Rou Gui ) is used with Prepared aconite root (Fu Zi ), Prepared rehmannia root (Shu Di Huang ) and donwood fruit (Shan Zhu Yu ) in the formula Gui fu Bawei Wan.2. Deficient yang of the spleen and kidneys manifested as cold pain in the epigastric and abdominal regions, poor appetite and loose stool.cinnamon bark (Rougui) is used with dried ginger (Gan Jiang ), White atractylodes (Bai Zhu ) and Prepared aconite root (Fuzi) in the formula Gui Fu Lizhong Wan.3. Cold stagnation in the meridians manifested as epigastric and abdominal cold ain, lower back pain, general pain, irregular menstruation and dysmenorrhea. Cinnamon bark (Rougui) is used with Dried ginger (Ganjiang), Evodia fruit (Wu Zhu Yu ), Chinese angelica root (Dang Gui ) and Chuan Xiong  rhizome (Chuanxing).4. Yin type of boils (chronic boils).Cinnamon bark (Rougui) is used with astragalus root (Huang Qi ) and Chinese angelica root (Danggui) in the formula Tuoli Huangqi Tang.
This herb is contraindicated during pregnancy.