Commercial Mayonnaise

Safety Status: Safe to Consume

Commercially manufactured, store-bought mayonnaise is entirely safe to consume during pregnancy.

Unlike homemade mayonnaise, which is typically made with raw egg yolks and carries a high risk of foodborne illness, the commercial food industry is subject to strict pasteurization regulations. According to the U.S. Department of Agriculture (USDA) and the Centers for Disease Control and Prevention (CDC), commercially packaged mayonnaise is made using pasteurized eggs, making it safe from Salmonella and other foodborne bacteria.

Pasteurization and Pathogen Control

The primary food safety concern with mayonnaise is Salmonella enteritidis, a bacterium commonly found inside raw eggs.

To eliminate this hazard, commercial food manufacturers use pasteurized liquid eggs. The pasteurization process involves heating the eggs to a precise temperature (typically around 140°F / 60°C) for a specific duration. This thermal process is high enough to kill any active Salmonella bacteria without cooking the egg proteins, allowing the eggs to emulsify properly into a smooth, creamy spread.

Additionally, commercial mayonnaise is highly acidic due to the inclusion of vinegar and lemon juice, which creates an inhospitable environment for bacterial growth.

Storage and Picnic Safety Cautions

While commercial mayonnaise is sterile when first opened, improper food handling can introduce bacteria:

• Refrigerate Immediately: Once the vacuum seal is broken, store-bought mayonnaise must be kept in the refrigerator at or below 40°F (4°C).
• The 2-Hour Rule: Never leave mayonnaise or mayonnaise-based foods (such as potato salad, chicken salad, or egg salad sandwiches) at room temperature for more than 2 hours (or 1 hour if the outdoor temperature is above 90°F / 32°C). Bacteria can grow rapidly on warm food, posing a risk of staphylococcal food poisoning.
• Picnics and Buffets: At gatherings, keep all mayonnaise-containing salads nested in bowls of ice, or store them in a chilled cooler until right before serving.
• Prevent Cross-Contamination: Always use a clean spoon or knife to scoop mayonnaise from the jar. Double-dipping with a utensil that has touched other foods can introduce bacteria into the jar, leading to mold or bacterial growth.