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Food Science Science Fair Project

Garlic vs. Bacteria

Garlic vs. Bacteria | Science Fair Projects | STEM Projects
In this experiment, we'll be testing the effectiveness of garlic in fighting bacteria. We'll measure the growth of bacteria colonies in petri dishes with and without garlic to see if garlic can really fight bacteria.


The hypothesis is that garlic will kill bacteria and prevent its further growth.

Method & Materials

You will prepare 3 agar petri dishes with blood agar, measure out 300ml of milk, extract garlic juice, add E. Coli specimen to test tubes, and measure the growth of the bacteria colonies.
You will need 3 agar petri dishes, 300ml milk, a measuring cup, 5 pieces of garlic, 3 test tubes, 4 syringes, an E. Coli specimen, 2 toothpicks, and a permanent marker pen.


The results showed that the test tube with the milk and E. Coli specimen had the largest colony of bacterial growth, while the test tube with milk, the E. Coli specimen, and garlic extract did not show any signs of bacterial growth. This proves that garlic can kill bacteria and prevent its further growth.

Why do this project?

This science project is interesting because it shows how a common kitchen ingredient can be used to fight bacteria.

Also Consider

Experiment variations to consider include boiling the garlic before extracting the garlic juice, and repeating the experiment using onions or cloves instead of garlic.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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