Many people eat mayonnaise regularly and never wonder what it’s made of.  Others know and are, therefore,  afraid to eat it.  The main ingredients are raw egg yolks (and sometimes also whole raw eggs), oil, vinegar and/or lemon juice, salt, and sometimes additional spices.  The raw eggs are what  make people worry  because they’ve heard  these sometimes contain harmful bacteria. However, commercial mayonnaise is actually a very safe product to eat.  Homemade mayonnaise made with raw, unpasteurized eggs is riskier.
Mayonnaise Shelf Life
Mayonnaise, opened- -2 months
Mayonnaise, unopened2-3 months1 year
Handling Tips: 
Refrigerate after opening
Boyer, Renee, and Julie McKinney. "Food Storage Guidelines for Consumers." Virginia Cooperative Extension (2009): n. pag. Web. 7 Dec 2009.

"Cupboard Storage Chart." K-State Research and Extension n. pag. Web. 23 Dec 2009. <>.

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