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Effectiveness of garlic in fighting bacteriaFeatured science projectScience project video


This experiment was done to find out if garlic is effective in killing bacteria. This will help us understand the effectiveness of home remedies such as the use of natural herbs (including garlic) for medicinal purposes.


Garlic will kill bacteria and prevent its further growth. 

Scientific Terms

Antimicrobial, antibiotics, microbes, bacteria, virus, petri dish


Herbs and spices have traditionally been used in cooking as they add flavor to our food. These herbs and spices have also been known to many cultures for their medicinal properties. The oils that are extracted from these spices and herbs are found to be effective in killing bacteria and viruses.

Garlic is known to have the ability to fight bacteria and viruses. It is known to be affective against a wide range of bacteria and also has the ability to combat the common cold. The antimicrobial substance in garlic is called allicin. Allicin consists of approximately 0.3% - 0.5% of the garlic. To maintain the antibacterial properties of garlic, it must be consumed or applied as raw garlic because cooking will destroy the allicin.

Frequent use of antibiotics causes the microbes to develop resistance against the drugs. Studies have shown that garlic has proven its ability to fight against bacteria that has developed resistance to antibiotics. The use of garlic along with other forms medication has been also known to enhance the effectiveness of these drugs.

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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 5 days for experiment
Material availability:
Easily found
Safety concerns:

The bacteria should be destroyed before disposal. Pour some bleach into the petri dishes to kill all the bacteria before disposing them in the trash.