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"Derived from the root of the plant. This supplement is used in traditional Chinese medicine primarily for gastrointestinal complaints, diarrhea, hypertension, bacterial and viral infections. Berberine and berberine-like alkaloids are thought responsible for its activity (1). Laboratory studies indicate that berberine induces morphological changes and internucleosomal DNA fragmentation in hepatoma cancer cells (3). Preliminary data support the hypothesis that huanglian suppresses cyclin B1 protein and causes cell cycle arrest at G2 (5). Huanglian has potent antiangiogenesis activity (6). It also interacts with acetylcholine and muscarinic receptors and inhibits cholinesterase. Possible adverse effects include nausea and vomiting (1). Theoretically huanglian may have additive hypotensive effects with antihypertensive agents. A phase I dose escalation study of huanglian in solid tumors is currently underway at Memorial Sloan-Kettering Cancer Center based on"