There is a common kitchen tip that says to store peeled garlic cloves in oil, unfortunately, botulism can develop when garlic is stored in this manner, especially if it is stored at room temperature. The garlic and oil should be used immediately or stored in the refrigerator for no more than a week. It's a handy tip but not worth the health risk.
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Storing and Using Garlic. I recently read where it is dangerous to cut up garlic and keep in oil because it can cause Botulism.