Synopsis

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

Scallion (Allium fistulosum), also known as spring onion or green onion, has a longstanding place in traditional East Asian medicine, particularly in Chinese and Korean herbal practices, as a remedy for colds and related symptoms. Historically, scallion has been included in herbal decoctions intended to "release the exterior," a principle in traditional Chinese medicine (TCM) referring to the treatment of early-stage colds and flu-like illnesses. The root of the scallion is often used in these preparations, sometimes in combination with ginger. Folk remedies cite its use for inducing mild sweating and promoting the resolution of early cold symptoms.

Modern scientific evidence for scallion's antiviral effects is limited but not entirely absent. Laboratory studies have identified some antimicrobial and mild antiviral properties in extracts of Allium species, including scallion. These effects are attributed to sulfur-containing compounds, such as allicin, which are better studied in garlic but also present in scallion. However, robust clinical trials demonstrating efficacy in treating or preventing colds in humans are lacking. Therefore, while tradition strongly supports its use and there is weak in vitro evidence for potential antiviral effects, scientific validation remains minimal. The use of scallion for colds is therefore best characterized as traditional with a low evidence rating.

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