Is Subway Mayonnaise High in Histamine?

Subway Mayonnaise

Moderate histamine

Subway's mayo is moderate in histamine, mostly from lemon juice concentrate and soybean oil.

Food here is usually assembled to order from components that were prepped earlier in the day, so it tends to be fresher than a drive-through and less fresh than cooking at home. Histamine builds up as protein foods sit, so how long the chicken or beef has been in the warmer matters as much as what is in the bowl. Treat the rating above as a starting point.

Histamine Liberator

This mayo is soybean oil, eggs, vinegar, salt, sugar, spice, and lemon juice concentrate.

Lemon juice concentrate leads — lemon is a histamine liberator, and it is the highest-histamine piece here, nudging the whole thing up.
Soybean oil and the mayo base — both sit at a moderate level, which is why the sauce lands at moderate overall rather than low.

If you want to keep your sub lower, a plain oil dressing is a gentler choice than this mayo.

This rating comes from Subway's own published ingredient statement, read on August 10, 2026. Restaurant recipes vary by location and change over time, so always check the current listing: source 1, source 2. How we rate foods →

Subway Mayonnaise and Subway 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.