Synopsis

Source of validity: Traditional
Rating (out of 5): 1

Blue Flag (Iris versicolor) has a history of use in North American herbal medicine, primarily among Indigenous peoples and later in eclectic and folk herbal practices. It was traditionally employed for a range of conditions, particularly as a "blood purifier" and for skin disorders. There is some documentation that Blue Flag was used to address ulcers, sores, and certain oral conditions, though canker sores (aphthous ulcers) are not always specifically named in historical sources. The root was sometimes prepared as a poultice or decoction for topical application to sores. However, this use is based on traditional knowledge and anecdotal reports rather than on systematic clinical evidence.

No contemporary scientific studies have validated the efficacy or safety of Blue Flag for the treatment of canker sores. In modern herbal practice, its use has significantly declined, partly due to concerns about potential toxicity and adverse effects, such as gastrointestinal irritation and nausea. Overall, the evidence for Blue Flag’s use in canker sores is rooted in tradition rather than science, and the support is weak and largely historical in nature.

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