Nevertheless, garlic and onions are immune-enhancing foods. They may not rapidly change your immune function quickly enough to make a difference once you become ill, but eating this family of foods on a regular basis is one of the components of super immunity.
My advice: continue to eat onions and garlic throughout the year and throughout any illness.

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Super Immunity: The Essential Nutrition Guide for Boosting Your Body's Defenses to Live Longer, Stronger, and Disease Free
While garlic has been believed to treat the common cold, the research is less than robust.
In a study of over 145 individuals, those who took garlic daily for three months suffered with a cold the same length of time as those taking a placebo. However, if you want to add it to chicken soup for a little flavor, it certainly won't hurt.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.