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, particularly in East Asian systems such as Traditional Chinese Medicine (TCM). In these traditions, green onion is often used as a remedy for the early stages of colds, especially when symptoms like mild chills, nasal congestion, and headache are present. It is sometimes combined with ginger in herbal decoctions or porridges to help “release the exterior” and induce mild sweating, which is believed to expel pathogens and alleviate cold symptoms. The decongestant effect is primarily attributed to the warming and pungent nature of green onion, which is thought to stimulate circulation and promote the flow of qi.

From a scientific perspective, there is limited evidence to directly support the use of green onion as a decongestant or for the treatment of colds in humans. Green onions do contain sulfur compounds and flavonoids with mild antimicrobial and anti-inflammatory properties, but clinical trials verifying their efficacy for cold relief are lacking. The rating of 2 reflects that while there is robust traditional use and plausible mechanisms, scientific validation remains minimal. Most recommendations for green onion in this context are based on historical practice rather than rigorous clinical research.

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