Colored Mistletoe Herb Classic Formulas

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Dispels wind-damp and alleviates painful obstruction - Hu Ji Sheng is used for chronic rheumatic pain, sore low back and knees, and weakness of sinews and bones when obstruction and deficiency coexist.
Tonifies the Liver and Kidneys and strengthens sinews and bones - beyond dispersing, it supports the deeper weakness that often underlies chronic joint and low-back presentations.
Calms the fetus - traditional use extends to threatened miscarriage and pregnancy low-back pain when deficiency and instability are prominent.

Hu Ji Sheng with Du Huo and Qin Jiao - wind-damp painful-obstruction strategy when deficiency also weakens the sinews.
Hu Ji Sheng with Xu Duan and Tu Si Zi - fetus-calming and Kidney-supportive pairing logic for threatened miscarriage or pregnancy low-back weakness.
Hu Ji Sheng with Niu Xi and Du Zhong - chronic low-back and knee weakness combination rooted in Liver-Kidney deficiency.

American Dragon describes Hu Ji Sheng as bitter and neutral, entering the Liver and Kidney, dispelling wind-damp, tonifying the Liver and Kidneys, strengthening sinews and bones, and calming the fetus.
Me & Qi notes that Hu Ji Sheng and Sang Ji Sheng were historically used under overlapping names, but modern scholars and pharmacopoeias separate Viscum coloratum from Taxillus-based Sang Ji Sheng.
This historical name overlap is important context for the record: Hu Ji Sheng is close to but not identical with the Sang Ji Sheng entry already in the library.