Radix Aucklandiae, known in classical Chinese medicine as Mu Xiang, is the dried root of Aucklandia lappa. Acrid, bitter, and warm in nature, entering the Spleen, Stomach, Large Intestine, and Gallbladder channels. The classical indications: abdominal distension, fullness, pain that improves with movement, diarrhea with tenesmus, and food stagnation.
Mu Xiang’s clinical signature is the relief of stagnation. In classical Chinese medicine, stagnation is a discrete pathological category, distinct from deficiency or excess. The herb moves Qi through the middle and lower abdomen, easing the bound-up quality of digestion that produces gas, fullness, and cramping. Modern research has begun to map the mechanism.
The active compounds are sesquiterpene lactones, particularly costunolide and dehydrocostus lactone. These molecules demonstrate antimicrobial activity against several gut pathogens, regulate intestinal smooth muscle motility, and protect the gastric mucosa against ulceration. Animal studies have shown the root extract significantly reduces gastric ulcer formation, both at the visible tissue level and in measured inflammatory markers.
The pharmacokinetics are being studied as research interest grows. Mu Xiang is one of the relatively few herbs in classical Chinese medicine where the molecular mechanism, the dosage range, and the absorption profile are increasingly well characterized.
The herb appears in many classical formulas in our Herb Market, including Xiang Sha Liu Jun Zi Tang and Xiang Sha Yang Wei Wan. It works in formulas that address bound, stagnant digestion rather than weakness or cold, which is why it is paired with specific other herbs depending on the pattern.
References
Cai, Xuewei, et al. “Antimicrobial effects and active compounds of the root of Aucklandia lappa Decne (Radix Aucklandiae).” Frontiers in Chemistry 10 (2022): 872480.
Song, Shen, et al. “Mechanism exploration of ancient pharmaceutic processing (Paozhi) improving the gastroprotective efficacy of Aucklandiae Radix.” Journal of Ethnopharmacology 287 (2022): 114911.
Han, Jian, et al. “Study of the effect of exceed critical extracts from Radix Aucklandiae on experimental gastric ulcer model.” Journal of Chinese Medicinal Materials 28.11 (2005): 1017-1019.
Dong, Shu, et al. “Pharmacokinetics of costunolide and dehydrocostuslactone after oral administration of Radix aucklandiae extract in normal and gastric ulcer rats.” Journal of Asian Natural Products Research 20.11 (2018): 1055-1063.
Feng, Lan, et al. “Pharmacological Mechanism of Aucklandiae Radix against Gastric Ulcer Based on Network Pharmacology and In Vivo Experiment.” Medicina 59.4 (2023): 666.
Wagner, Hildebert, et al. “Radix Aucklandiae–Muxiang.” Chromatographic Fingerprint Analysis of Herbal Medicines Volume III (2015): 243-253.
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