Coptis (Huang Lian) and Berberine: Traditional Source and Modern Research

Huang Lian is the dried rhizome of Coptis chinensis, a plant used in Chinese medicine for a very long time. It is also one of the plants that contain berberine, the compound sold on its own as a supplement. This page covers the traditional herb and what researchers have studied. The berberine supplement has its own guide: Berberine.

Urgent first

Berberine can raise the blood level of some medicines, including transplant drugs such as cyclosporine. [1] The National Center for Complementary and Integrative Health (NCCIH, US) advises that people who are pregnant or breastfeeding should not use goldenseal, a plant that also contains berberine, and says its berberine can be harmful to newborns. [2] If you take prescription medicines, talk to your prescriber or pharmacist before using Huang Lian or berberine. Do not stop or change a prescribed medicine on your own.

Traditional use

A review of Huang Lian's traditional use describes its role in Chinese medicine as removing damp-heat, purging fire and counteracting toxicity. [3] These are traditional frameworks, not measurements of anything in the body. Read more in How Chinese herbs are classified and Cold, heat, dampness and other common TCM terms.

Coptis versus berberine

Berberine is one chemical in Huang Lian. A review of Huang Lian and berberine found that other related alkaloids in the root may add to its effects, and in some anticancer studies the whole root performed better than berberine alone. [3] That finding came from laboratory work, not from trials in people. So results from berberine supplement trials do not automatically describe the herb, and the reverse is also true.

What research shows

The Coptis meta-analysis combined trials of several prescriptions that contained the herb, not Huang Lian alone, so it cannot show what the root itself does. [5] See Publication bias in TCM research for why that note matters, and TCM for type 2 diabetes for the wider picture.