Matrine

Matrine is a naturally occurring alkaloid with the formula C15H24N2O, belonging to the quinolizidine class defined by its fused four-ring, nitrogen-containing structure. It is extracted chiefly from Sophora flavescens and related species such as Sophora tonkinensis and Sophora alopecuroides, plants used for centuries in traditional Chinese medicine ^[3]. In that tradition the source herb, Kushen, is characterized as bitter and cold and has been employed to clear heat, dry dampness, expel parasites, and promote urination, appearing in remedies for skin conditions, gastrointestinal complaints, and inflammation ^[1]. Matrine and its oxidized relative oxymatrine are regarded as the main compounds responsible for these effects ^[1][4].

Modern pharmacological research has focused heavily on matrine's antitumor activity. In laboratory and animal studies it has been reported to slow the growth and proliferation of cancer cells, trigger programmed cell death, arrest the cell cycle, curb tumor invasion and metastasis, inhibit the formation of new blood vessels, and, in some models, help reverse resistance to conventional chemotherapy drugs ^[2]. Reviews summarizing this work describe activity across many cancer types in vitro and in vivo, while emphasizing that most evidence comes from preclinical models ^[2][3]. The related alkaloid oxymatrine has shown broadly similar anticancer and liver-protective properties in comparable studies ^[4].

Beyond oncology, matrine has been studied for anti-inflammatory, antiviral, antifibrotic, and antimicrobial effects, and for actions on the nervous system, including analgesic effects that source reviews link to opioid receptor pathways, along with neuroprotective and mood-related effects in models of liver-injury-associated brain inflammation ^[1][3]. In agriculture, matrine and oxymatrine are used as botanical pesticides, showing insecticidal and nematicidal activity, and matrine-based products are marketed as natural crop protectants ^[1].

Matrine is available as a purified compound and within Sophora extracts, and in some regions oral and injectable matrine or compound-Kushen preparations are used adjunctively in cancer care, though such use is not established to the standard of large controlled trials ^[1][2]. A recurring theme in the literature is caution about safety: matrine can be toxic, particularly to the nervous system and liver at higher exposures, and its therapeutic use is further limited by relatively poor and variable bioavailability, which has motivated efforts to modify its structure or improve its delivery ^[1][3]. It is not a scheduled drug in many countries and is encountered both as a research chemical and as an ingredient in traditional formulas and agricultural products ^[1].

Matrine has a narrower safety margin than most supplements; higher doses can cause neurological effects and possible liver toxicity, and the related alkaloid oxymatrine shares these concerns. It should not be used casually or long-term without oversight, and never in pregnancy. Quality and dosing of extracts vary widely.