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

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Synopsis

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

Garlic (Allium sativum) has a long history of traditional use as a remedy for colds and respiratory ailments, particularly as a decongestant. Modern scientific studies have investigated its potential role in preventing and treating the common cold. The key bioactive compound in garlic, allicin, has demonstrated antimicrobial and antiviral properties in laboratory settings. A notable randomized controlled trial published in 2001 in the journal Advances in Therapy found that participants taking a daily garlic supplement for 12 weeks had significantly fewer colds and recovered faster compared to those taking a placebo. However, the number of high-quality clinical trials is limited, and results are somewhat mixed; some studies suggest only a modest benefit, while others find little effect compared to placebo.

Garlic is also believed to support immune function by enhancing the activity of certain white blood cells. While these effects could theoretically contribute to shorter or less severe colds, direct evidence for garlic as a decongestant is sparse. Most benefits appear to relate more to immune modulation than to acute relief of nasal congestion. Overall, while there is some scientific basis for garlic’s use in reducing the frequency and duration of colds, the evidence supporting its direct use as a decongestant is limited, and further well-designed studies are needed.

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