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To be safe, a garlic and oilTo be safe, a garlic and oil mixture has to have some acid agent like citric or phosphoric acid added (and it has to be refrigerated, too). The FDA recommends that if you want to make your own infused garlic oil, you should prepare it fresh and use it right away. If you are saving any leftovers, you must refrigerate it right away and use within a week.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?