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The source is from the bark of Cinnamomum cassia Presl, family Lauraceae. The medicinal material is mainly produced in the areas of Guangdong, Guangxi, and Yun-nan, etc. , barked in autumn and then the bark is dried in the shade, cut into pieces or powdered and the crude form is used.
Medicinal Properties: Pungent and sweet in flavor, hot in nature and attributive to the spleen, kidney and heart meridians.
Actions: Supplement fire and strengthen yang, expel cold and alleviate pain, warm channels to promote the circulation of the blood.
Notes: Contraindicated for bleeding due to bloodheat, and used with caution for hypermenorrhea and in pregnant women.