Synopsis

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

Green onion (Allium fistulosum), also known as scallion or spring onion, has a long history of use in traditional medicine systems, particularly in East Asia, for the prevention and treatment of colds. In Traditional Chinese Medicine (TCM), green onion is classified as a warming herb used to "dispel wind-cold" and promote sweating, which is thought to help release the exterior and treat the early stages of cold symptoms such as chills, congestion, and mild fever. Preparations often involve boiling green onion with ginger to make a warming tea. While these uses are well-documented in traditional texts, there is limited scientific validation for the efficacy of green onion in preventing or treating the common cold. Some laboratory studies have noted that Allium species, including green onion, possess mild antimicrobial and immune-modulating properties, but these findings are preliminary and not directly linked to clinical outcomes for colds. Overall, the use of green onion for colds is primarily justified by traditional practice rather than strong scientific evidence.

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