Synopsis

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

Sinapis arvensis (wild mustard) has been traditionally used in various cultures for the symptomatic relief of sprains and other musculoskeletal complaints. Historically, poultices made from mustard seeds—sometimes specifically from Sinapis arvensis, but more often from closely related species such as Sinapis alba—were applied externally to the affected area. The rationale behind this usage is based on the irritant properties of mustard seeds, which can increase local blood flow and produce a warming sensation. This counterirritant effect was thought to help alleviate pain and promote healing in cases of sprains and similar injuries.

Despite its traditional use, there is minimal direct scientific evidence supporting the efficacy of Sinapis arvensis for treating sprains. Most modern references to mustard poultices refer to general mustard species, and well-designed clinical trials are lacking. The mechanism—counterirritation and increased circulation—has some physiological plausibility, but has not been specifically validated for Sinapis arvensis or for the treatment of sprains. In summary, while the traditional use is documented, scientific support is weak, and the evidence rating remains low.

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