Mayonnaise

Mayo is mostly oil and egg, but the acid used for flavor and preservation is where the histamine concern often comes in.

• Vinegar in most brands — most commercial mayonnaise contains vinegar, which is widely listed as problematic on histamine sensitivity lists; some brands use lemon juice or citric acid instead, which may be better tolerated

• Preservatives and additives — some commercial versions include additives that people with histamine sensitivity often report reacting to, on top of the acid

Homemade mayo made with lemon juice instead of vinegar is an option some people find noticeably easier to tolerate.