Garlic supplements are known to boost the function of the immune system.

One large, 12-week study found that a daily garlic supplement reduced the number of colds by 63% compared to a placebo.

The average length of cold symptoms was also reduced by 70%, from 5 days in the placebo group to just 1.5 days in the garlic group.

Another study found that a high dose of aged garlic extract (2.56 grams per day) reduced the number of days sick with cold or flu by 61%.

However, one review concluded that the evidence is insufficient and more research is needed.

Despite the lack of strong evidence, adding garlic to your diet may be worth trying if you often get colds.

SUMMARYGarlic supplements help prevent and reduce the severity of common illnesses like the flu and common cold.