Herbs that Release the Exterior

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Which herb releases the exterior and the muscle layer, especially for stiff neck and upper back?

Mu Zei (equiseti hiemalis herba)
Ge Gen (peurariae radix)
Sheng Ma (cimicifugae rhizoma)
Jing Jie (schizonepetae herba)

Gui Zhi is another herb that also releases the muscle layer. Gui Zhi and Ge Gen are often used together for exterior attacks with stiffness in the neck and upper back.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 70-71. [Q915]