The beauty of Chinese herbal formulas is the ability to create formulas that target specific parts of the anatomy. In the case of front leg aches, it is mostly associated with the shoulder area and shoulder blades.
According to Traditional herbal theory, stiffness of this area is due to a deregulation of one the yang channels located on the front of the legs or the Lung Channel located on inside of the get..
Both internal and external causes may cause shoulder and front leg aches and stiffness, but in most instances the disturbance of the flow of Qi and Blood through the shoulder and front leg area is due to External pathogenic factors, deficiency of Qi, stagnation of Qi, stagnation of Blood, and lastly the accumulation of Damp-Phlegm.
This particular formula based on the very famous formula Juan Bi Tang (Remove Painful Obstruction) is modified to account for all the patterns listed above.
This formula Juan Bi Tang modified with added flavors is used to help with obstruction of front leg channels due to Wind-Damp and Cold. Because of a deficiency of the Wei Qi (Exterior) and the Blood level (interior), External factors have access to the interior, and lodge to create an obstructive disturbances of Qi and Blood. When Qi and Blood are obstructed there will be pain.
The function of this formula is to remove the obstruction and promote the free flow of Qi and Blood in the upper regions of the body.