Is Sonic Mayonnaise High in Histamine?

Sonic Mayonnaise

High histamine

Sonic's mayonnaise runs high, mostly because of the mustard flour worked into it.

Fast food is cooked in batches and held warm rather than made when you order it, so it is rarely as fresh as something cooked at home. That matters here because histamine builds up as protein foods sit, which means the same item can affect you differently depending on how long it waited.

This is a classic mayo of soybean oil, egg yolks, eggs, vinegar, salt, sugar, and mustard flour.

Mustard flour is the main driver — ground mustard tends to run high in histamine, and it's what pushes this sauce up even in small amounts.
Mayonnaise and soybean oil add to it — the mayo base itself sits at moderate, and soybean oil is moderate too, so the sauce lands high overall.

If you want a condiment that's easier, a plain unsauced order is the safer path here.

This rating comes from Sonic's own published ingredient statement, read on August 23, 2026. Restaurant recipes vary by location and change over time, so always check the current listing: source 1, source 2. How we rate foods →

Sonic Mayonnaise and Sonic are trademarks of their respective owners. This page is an independent histamine reference and is not affiliated with, endorsed by, or sponsored by the brand.