Mayonnaise is a popular kitchen staple used in sandwiches, salads, and countless favorite recipes. Although commercially produced mayonnaise is generally safe when handled correctly, improper storage and careless handling can increase the risk of contamination. Most store-bought varieties contain pasteurized eggs and acidic ingredients that help prevent harmful bacteria from growing. However, using dirty utensils or allowing food particles to enter the jar can compromise its safety.

One of the most important rules is keeping mayonnaise refrigerated after opening, following the instructions on the label. Your refrigerator should be set at or below 40°F (4°C) to help keep perishable foods safe. Mayonnaise-based dishes, such as potato salad and egg salad, should not sit out for too long. Food safety guidance recommends discarding perishable foods left at room temperature for more than two hours, or one hour when temperatures exceed 90°F (32°C).

Homemade mayonnaise requires particular attention because traditional recipes often use raw eggs. These eggs may contain Salmonella, a bacterium that can cause food poisoning. To reduce this risk, use pasteurized eggs or pasteurized egg products, refrigerate the mayonnaise promptly, and prepare it using clean equipment. Homemade mayonnaise also tends to have a shorter storage life than commercial varieties, so avoid keeping it for extended periods.

Before using mayonnaise, check for unusual odors, discoloration, or changes in texture. These signs may indicate spoilage, but their absence does not guarantee that the product is safe. Always follow the manufacturer’s storage instructions and use the product within the recommended period after opening. If the mayonnaise has been stored improperly or you are unsure whether it is safe, it is better to throw it away than take a risk.

Keeping mayonnaise safe doesn’t require complicated measures. Use clean utensils, close the lid securely, refrigerate the jar promptly after each use, and avoid leaving it on the table during long meals or outdoor gatherings. These simple habits can reduce the risk of foodborne illness and help you enjoy your favorite foods with greater peace of mind.