Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Dyer’s woad root (Isatis tinctoria), known as Ban Lan Gen in Traditional Chinese Medicine (TCM), has a long history of use in East Asian herbal medicine. Traditionally, it is employed to "clear heat," "resolve toxicity," and support the body’s natural defenses, especially for conditions involving infection and inflammation. While its primary traditional uses center on viral infections (such as influenza) and sore throat, there are also records in TCM materia medica suggesting topical application of the root (or its extracts) to treat minor wounds, scratches, and abrasions. The rationale is that its purported "detoxifying" and anti-inflammatory properties help prevent infection and support the healing process.

Modern scientific studies have identified that Isatis tinctoria root contains compounds with antibacterial, antiviral, and anti-inflammatory effects in vitro and in animal models. Some laboratory findings show inhibition of common skin pathogens such as Staphylococcus aureus. However, robust clinical trials demonstrating efficacy specifically for scratches and abrasions in humans are lacking. There is also little direct evidence about safety or optimal formulations for topical use. Thus, its use for scratches and abrasions is primarily justified by historical tradition, with only limited scientific corroboration at the preclinical level.

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