Synopsis

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

Scallion (Allium fistulosum), also known as green onion or spring onion, is traditionally used in East Asian herbal medicine to help treat colds, particularly during the early stages. In Traditional Chinese Medicine (TCM), scallion is believed to "release the exterior"—that is, to induce mild sweating and thus expel pathogens from the body's surface. Classic texts such as the Shennong Bencao Jing and various later materia medica describe scallion as being warming and useful against "wind-cold" invasions, a TCM diagnosis roughly corresponding to the common cold, especially those with chills and absence of sweating.

From a scientific standpoint, scallions contain sulfur compounds (similar to those found in garlic and onions) with mild antimicrobial properties. However, there are no robust clinical studies demonstrating scallion’s efficacy as a decongestant or cold remedy in humans. Some in vitro studies suggest antibacterial and antiviral activities, but these findings have not been directly translated into clinical outcomes for upper respiratory infections. The use of scallion for treating colds remains supported primarily by tradition and anecdotal reports within herbal medicine, rather than by strong scientific evidence or randomized controlled trials.

In summary, while scallion is widely used in traditional practices for colds and mild congestion, this use is not substantiated by high-quality scientific research, and its evidence rating reflects reliance on historical and cultural precedent rather than modern clinical validation.

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