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Related Experiment Video

Updated: Jun 21, 2026

Measuring Volatile and Non-volatile Antifungal Activity of Biocontrol Products

Measuring Volatile and Non-volatile Antifungal Activity of Biocontrol Products

Published on: December 5, 2020

Garlic for the common cold.

Elizabeth Lissiman¹, Alice L Bhasale, Marc Cohen

¹Faculty of Medicine, Dentistry & Health Sciences, University of Western Australia, Crawley, WA, Australia, 6009.

The Cochrane Database of Systematic Reviews

|July 10, 2009

Summary

This summary is machine-generated.

Garlic supplements may reduce common cold occurrences, but more research is needed. A single study indicated potential benefits, though evidence remains limited.

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Last Updated: Jun 21, 2026

Measuring Volatile and Non-volatile Antifungal Activity of Biocontrol Products

Measuring Volatile and Non-volatile Antifungal Activity of Biocontrol Products

Published on: December 5, 2020

Area of Science:

Evidence-based medicine
Complementary and alternative medicine
Respiratory infections

Background:

Garlic (Allium sativum) is widely used and believed to possess antimicrobial and antiviral properties.
The common cold causes significant morbidity and economic impact, with frequent occurrences in children and adults.
Widespread use of garlic supplements necessitates scientific evaluation of their efficacy.

Purpose of the Study:

To evaluate the effectiveness of garlic for preventing or treating the common cold.
To compare garlic interventions against placebo, no treatment, or other interventions.

Main Methods:

Searched multiple databases including CENTRAL, MEDLINE, EMBASE, and AMED for randomized controlled trials.
Included trials comparing garlic with placebo, no treatment, or standard care for common cold prevention or treatment.
Two reviewers independently selected trials, assessed quality, and extracted data.

Main Results:

Only one randomized controlled trial met the inclusion criteria, involving 146 participants over 12 weeks.
The garlic group (180 mg allicin daily) showed significantly fewer common cold occurrences (24 vs. 65) and fewer days of illness (111 vs. 366) compared to placebo.
Recovery time was similar between groups; adverse effects included rash and odor. Limited conclusions can be drawn due to the single trial.

Conclusions:

Insufficient clinical evidence exists to confirm garlic's effectiveness in preventing or treating the common cold.
A single trial suggests garlic may reduce cold incidence, but further studies are required for validation.
Current claims of garlic's efficacy for colds may be based on limited or low-quality evidence.