Synopsis

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

Rhizomes, specifically from plants such as Zingiber officinale (ginger) and Curcuma longa (turmeric), have a long history of use in traditional medicine systems (e.g., Traditional Chinese Medicine, Ayurveda) for the treatment of colds and as decongestants. In these traditions, ginger rhizome is often prepared as a tea or decoction to relieve symptoms such as nasal congestion, sore throat, and cough. The warming nature of ginger, in particular, is believed to help "dispel wind-cold" in traditional Chinese medicine, which is associated with cold and flu symptoms. Turmeric is also sometimes used for its anti-inflammatory and immune-supportive properties.

Scientific research supporting these traditional uses is limited but suggests that some rhizomes possess mild anti-inflammatory, antioxidant, and immunomodulatory properties. For example, ginger has been shown in some studies to reduce inflammation and may help with mild upper respiratory symptoms, but strong clinical evidence confirming its efficacy specifically as a decongestant or as a treatment for colds is lacking. Most evidence comes from small, low-quality studies or in vitro experiments rather than large, rigorous clinical trials. Therefore, while the use of rhizomes for colds and as decongestants is well-supported by tradition, robust scientific validation is insufficient, and the evidence should be considered modest (rated 2/5).

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