Synopsis

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

Oak bark (Quercus robur, Quercus alba, and related species) has a long history of traditional use as a topical astringent for treating minor external bleeding. The effectiveness is attributed to its high content of tannins, polyphenolic compounds known for their astringent and vasoconstrictive properties. In folk medicine across Europe and North America, poultices or washes prepared from oak bark have been applied to cuts, abrasions, and minor wounds to help staunch bleeding and promote healing.

Scientific validation for this practice is limited, with few clinical studies directly evaluating the efficacy of oak bark for external bleeding in humans. However, the astringent effect of tannins is well-documented: they precipitate proteins, leading to a constriction of tissue and blood vessels, which can help reduce minor bleeding. Pharmacopoeias, such as the German Commission E, list oak bark as a traditional astringent for topical use, but note the lack of robust clinical trials.

In summary, while modern scientific validation is limited, the use of oak bark for external bleeding is well-established in traditional medicine and supported mechanistically by its tannin content. The overall evidence, however, remains modest and largely historical, warranting a rating of 2 out of 5.

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More about Bleeding (external)

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