Synopsis

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

Garlic (Allium sativum) has a long history of traditional use as a remedy for colds and other infections, and there is also scientific evidence suggesting potential antiviral and immune-supportive effects. Several laboratory studies have shown that garlic extracts possess antimicrobial activity against a range of viruses and bacteria, including those that cause upper respiratory tract infections. The primary active constituent, allicin, is released when garlic is crushed or chopped and is believed to contribute to its antiviral properties. In human studies, evidence is more limited but promising: a notable randomized, double-blind, placebo-controlled trial published in 2001 (Josling P, Adv Ther. 2001) found that participants taking a daily garlic supplement had significantly fewer colds and recovered faster than those taking a placebo. However, the number of high-quality clinical trials is small, and some studies have methodological limitations, such as small sample sizes and variations in garlic preparation and dosage. Overall, while traditional use is strong and laboratory data are supportive, the clinical evidence in humans is moderate, warranting a rating of 3. Garlic is generally considered safe for most people when consumed as part of the diet, but concentrated supplements may cause gastrointestinal upset or interact with certain medications. Further large-scale, rigorous trials are necessary to better define garlic's efficacy in preventing or treating the common cold.

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Other ingredients used for Colds (antiviral)

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