Synopsis

Source of validity: Traditional
Rating (out of 5): 3

Allium species, particularly garlic (Allium sativum) and onion (Allium cepa), have a long history of traditional use in various cultures for managing colds and other respiratory infections. Their use is primarily rooted in folk medicine, where they are believed to possess antiviral, antimicrobial, and immune-boosting properties. Garlic, for example, contains compounds such as allicin, which has demonstrated some in vitro antiviral activity. Historically, Allium preparations such as raw garlic or onion syrups have been consumed at the onset of cold symptoms to help reduce severity or duration.

Scientific evidence supporting the efficacy of Allium for treating colds is limited but suggestive. Some clinical studies have indicated that garlic supplementation may reduce the frequency of colds, though the effect on duration or severity is less clear. Systematic reviews and randomized controlled trials have generally found insufficient high-quality evidence to firmly recommend Allium species as effective antiviral agents for colds. The majority of claims are therefore supported by traditional use, with a moderate but not robust scientific foundation. As a result, the use of unspecified Allium for colds is best characterized as traditional, with moderate (level 3) supporting evidence.

More about Allium (unspecified)
More about Colds (antiviral)

Other ingredients used for Colds (antiviral)

Other health conditions supported by Allium (unspecified)

Products containing Allium (unspecified)