Evidence supporting the use of: Limonene
For the health condition: Colds (decongestant)

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Synopsis

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

Limonene, a major component of citrus essential oils, has traditionally been used in aromatherapy and folk medicine to support respiratory health and relieve symptoms of colds, including congestion. Its use as a decongestant is primarily based on anecdotal and traditional practices, particularly in the context of inhaling vapors from citrus peels or essential oils. The rationale is that the strong, fresh aroma of limonene-containing oils can provide a subjective feeling of clearer airways, similar to how menthol is used. However, scientific evidence to substantiate limonene's efficacy as a decongestant is limited. Most studies on limonene have focused on its anti-inflammatory, antioxidant, and antimicrobial properties, rather than direct effects on nasal or sinus congestion. While some in vitro and animal studies suggest limonene may reduce inflammation and have mild antimicrobial effects, there are no robust clinical trials demonstrating that limonene is effective for relieving cold symptoms in humans. Therefore, its use for this purpose is best characterized as traditional, with only weak supporting evidence from preliminary scientific studies.

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