Coptis chinensis

Coptis chinensis, also known as Chinese goldthread or "Huang Lian" (黄连), is a perennial plant from the buttercup family (Ranunculaceae). Native to the cool, moist mountain regions of China – particularly the provinces of Sichuan, Hubei, and Yunnan – it prefers to grow in the understory of shady forests. The strikingly yellow color of its bulbous rhizomes has earned the plant not only its common name but also its traditionally high standing in East Asian healing traditions. For more than 2000 years, Coptis chinensis has been used in Traditional Chinese Medicine (TCM) – usually in the form of decoctions, tinctures, or powdered extracts. The plant is considered distinctly "bitter" in taste and is traditionally used in TCM for the clearing of "internal heat", for reducing inflammation, and to support gastrointestinal functions. Pharmacologically, its high content of alkaloids is particularly interesting, above all berberine, which is considered the plant's main active compound. Due to its versatile biological properties, Coptis chinensis is also increasingly moving into the focus of modern research – particularly in connection with antimicrobial, blood-sugar-lowering, and anti-inflammatory potentials.

What benefits does Coptis chinensis offer for health? The root of Coptis chinensis is valued in naturopathy primarily for its bitter alkaloid compounds. Studies point to several potentially health-promoting properties. However, these properties have not yet been conclusively investigated, so more research is necessary here to fully understand the effects. Here are some of the study findings to date:

  • Inflammation reduction: The plant contains various bioactive substances that can dampen inflammatory processes in the body and reduce oxidative stress (1,2,3).
  • Antioxidant effect: The active compound berberine showed an antioxidant effect in studies, which could help in combating free radicals (1,4,5).
  • Antimicrobial effect: In vitro, berberine shows a pronounced effect against bacteria, viruses, and fungi – including Helicobacter pylori, Candida albicans, and various intestinal bacteria (6,7,8).
  • Support for the digestive system: In TCM, the plant is traditionally used for diarrhea, nausea, vomiting, or digestive disorders. Modern studies partially confirm this effect and likewise show positive effects on gut health (9,10).
  • Blood sugar regulation: Berberine can increase insulin sensitivity and lower blood sugar levels – in studies, the effect was in some cases comparable to that of metformin (11,12).
  • Neuroprotective effects: Coptis chinensis and its active compounds, especially berberine, have shown neuroprotective effects in various studies (13,14).

How does Coptis chinensis work in the body? The central active compound berberine acts at the cellular level. As a result, berberine was able in studies to improve glucose metabolism, lower lipid levels, and inhibit inflammatory signaling pathways, among other effects. Further alkaloids such as palmatine, coptisine, and jatrorrhizine contribute to the plant's great medicinal potential and to its various effects (1).

Are there risks or side effects?

  • Not suitable for pregnant or breastfeeding women: Due to its high berberine content, Coptis chinensis should not be taken during pregnancy and breastfeeding (6).
  • Interactions with medications: Berberine could affect certain liver enzymes, which can lead to interactions with medications – especially with blood-pressure-lowering or blood-sugar-lowering preparations.
  • Recommended only to a limited extent for long-term use: With prolonged use, side effects such as constipation or liver damage can occur – intake should therefore take place under expert supervision.

Conclusion Coptis chinensis is a medicinal plant rich in tradition with remarkable therapeutic potential – particularly due to its high berberine content. Its traditional applications range from supporting digestion to regulating blood sugar levels. Even though modern studies confirm many of its traditional areas of use, its use is not free of risks and should be professionally supervised. In addition, more research is necessary to conclusively understand its effects. In the right dosage and with attention to possible interactions, however, Coptis chinensis could be a valuable herbal active compound.

Sources:

  1. Li, M., Tian, F., Guo, J., Li, X., Ma, L., Jiang, M., & Zhao, J. (2023). Therapeutic potential of Coptis chinensis for arthritis with underlying mechanisms. Frontiers in pharmacology, 14, 1243820. https://doi.org/10.3389/fphar.2023.1243820
  2. Yang, Y., Vong, C. T., Zeng, S., Gao, C., Chen, Z., Fu, C., Wang, S., Zou, L., Wang, A., & Wang, Y. (2021). Tracking evidences of Coptis chinensis for the treatment of inflammatory bowel disease from pharmacological, pharmacokinetic to clinical studies. Journal of ethnopharmacology, 268, 113573. https://doi.org/10.1016/j.jep.2020.113573
  3. Danielewski, M., Zielińska, S., Matuszewska, A., Słupski, W., Włodarczyk, M., Jęśkowiak, I., Wiatrak, B., Kowalski, K., Jezierska-Domaradzka, A., Ziółkowski, P., Szeląg, A., & Nowak, B. (2022). Sanguinarine-Chelerythrine Fraction of Coptis chinensis Exerts Anti-inflammatory Activity in Carrageenan Paw Oedema Test in Rats and Reveals Reduced Gastrotoxicity. Oxidative medicine and cellular longevity, 2022, 1504929. https://doi.org/10.1155/2022/1504929
  4. Ban, X., Huang, B., He, J., Chen, Y., Zeng, H., Han, L., & Wang, Y. (2011). In vitro and in vivo antioxidant properties of extracts from Coptis chinensis inflorescence. Plant foods for human nutrition (Dordrecht, Netherlands), 66(2), 175–180. https://doi.org/10.1007/s11130-011-0225-5
  5. Zhang, Q., & Liang, X.-c. (2015). Progress in study of antioxidant effects of Coptis chinensis and its major contributions to diabetes treatment/therapy. Zhongguo Zhongyao Zazhi (China Journal of Chinese Materia Medica), 40, 2285–2288. https://doi.org/10.4268/cjcmm20151204
  6. Tseng, C. Y., Sun, M. F., Li, T. C., & Lin, C. T. (2020). Effect of Coptis chinensis on Biofilm Formation and Antibiotic Susceptibility in Mycobacterium abscessus. Evidence-based complementary and alternative medicine : eCAM, 2020, 9754357. https://doi.org/10.1155/2020/9754357
  7. Tseng, C.-Y., Sun, M.-F., Kao, T.-C., Li, T.-C., & Lin, C.-T. (2022). Role of Coptis chinensis in antibiotic susceptibility of carbapenem-resistant Klebsiella pneumoniae. Journal of Microbiology, Immunology and Infection, 55(5), 946–955. https://doi.org/10.1016/j.jmii.2021.07.003
  8. Githeng'u, S., Nyalala, S., & Liu, G. (2016). Antibacterial activity of Coptis chinensis extract against Pectobacterium carotovorum subsp. carotovorum. International Journal of Phytopathology, 5(2), 61–66. https://doi.org/10.33687/phytopath.005.02.1159
  9. Wang, Y. X., Zhang, J. Y., Cao, Y. M., Liu, T., Zhang, Z. K., Zhang, B. X., Feng, W. S., Li, K., Zheng, X. K., & Zhou, N. (2023). Coptis chinensis-Induced Changes in Metabolomics and Gut Microbiota in Rats. The American journal of Chinese medicine, 51(6), 1547–1576. https://doi.org/10.1142/S0192415X23500702
  10. Zhou, R., Huang, Y., Tian, C., Yang, Y., Zhang, Z., & He, K. (2023). Coptis chinensis and Berberine Ameliorate Chronic Ulcerative Colitis: An Integrated Microbiome-Metabolomics Study. The American journal of Chinese medicine, 51(8), 2195–2220. https://doi.org/10.1142/S0192415X23500945
  11. Zhen, Z., Chang, B., Li, M., Lian, F. M., Chen, L., Dong, L., Wang, J., Yu, B., Liu, W. K., Li, X. Y., Qin, P. J., Zhang, J. H., & Tong, X. L. (2011). Anti-diabetic effects of a Coptis chinensis containing new traditional Chinese medicine formula in type 2 diabetic rats. The American journal of Chinese medicine, 39(1), 53–63. https://doi.org/10.1142/S0192415X11008646
  12. Cui, L., Liu, M., Chang, X., & Sun, K. (2016). The inhibiting effect of the Coptis chinensis polysaccharide on the type II diabetic mice. Biomedicine & Pharmacotherapy, 81, 111–119. https://doi.org/10.1016/j.biopha.2016.03.038
  13. Friedemann, T., Ying, Y., Wang, W., Kramer, E. R., Schumacher, U., Fei, J., & Schröder, S. (2016). Neuroprotective Effect of Coptis chinensis in MPP[Formula: see text] and MPTP-Induced Parkinson's Disease Models. The American journal of Chinese medicine, 44(5), 907–925. https://doi.org/10.1142/S0192415X16500506
  14. Singh, K., Gupta, J. K., Jain, D., Chaudhary, A. N., Kumar, S., Sharma, M. C., & Singh, B. (2024). Unveiling the therapeutic potential of traditional Chinese medicine Rhizome Coptidis: A comprehensive review. Pharmacological Research - Modern Chinese Medicine, 13, 100522. https://doi.org/10.1016/j.prmcm.2024.100522