Evidence supporting the use of: Sweet flag
For the health condition: Colds (with fever)

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Synopsis

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

Sweet flag (Acorus calamus) has a long history of use in traditional medicine systems, particularly in Ayurveda and traditional Chinese medicine, for addressing symptoms of colds, including those accompanied by fever. In Ayurveda, sweet flag is referred to as "Vacha" and is believed to possess warming, expectorant, and antimicrobial properties. It is commonly administered in formulations meant to clear respiratory congestion, reduce fever, and soothe sore throats. Ancient texts describe its use as a remedy for "Kapha" imbalances, which are associated with mucus and respiratory conditions.

The traditional rationale for its use centers on its aromatic rhizomes, which are thought to help open nasal passages, promote sweating (thereby reducing fever), and relieve cough. Sweet flag may be prepared as a powder, decoction, or infused in ghee for easier administration, especially for children.

However, scientific evidence to validate these traditional uses is limited. A few laboratory studies have found that extracts of Acorus calamus possess mild antimicrobial and anti-inflammatory effects, but these findings are preliminary and not specific to viral pathogens responsible for colds. There are no robust clinical trials demonstrating efficacy for colds with fever in humans. Additionally, concerns about the safety of certain compounds (notably beta-asarone) in sweet flag have led to regulatory restrictions in some countries. In summary, its use for colds with fever is primarily justified by tradition, with limited modern scientific support.

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