Synopsis

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

Black mustard (Brassica nigra) has a history of traditional use in supporting respiratory health, including the alleviation of sinus congestion. In folk medicine, black mustard seeds or mustard plasters have been applied externally to the chest or sinuses with the aim of stimulating circulation and promoting the clearance of mucus. The mechanism is generally attributed to the irritant properties of allyl isothiocyanate, a volatile compound released when the seeds are crushed and mixed with water, which can produce a warming sensation and mild local hyperemia (increased blood flow). This is thought to help loosen mucus, making it easier to expel and thereby temporarily relieving congestion symptoms.

However, while these uses are well-documented in ethnobotanical and traditional sources, robust scientific evidence supporting the efficacy of black mustard for sinus congestion is lacking. Clinical trials are absent, and most of the available literature describes anecdotal or historical applications rather than controlled research findings. Furthermore, topical application of mustard plasters can cause skin irritation or burns if not used cautiously. Overall, the use of black mustard for congestion is primarily based on tradition, with limited scientific validation.

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