Is Firehouse Subs Large White Sub Roll High in Histamine?

Firehouse Subs Large White Sub Roll

High histamine

Firehouse Subs' Large White Sub Roll is high in histamine because of the vinegar in the dough.

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.

Gluten

This is a soft white roll made from enriched wheat flour, malted barley, yeast, soybean oil, and a little vinegar.

The vinegar: it rates high and is baked into the dough, which is the main reason this roll now lands high.
Yeast, malted barley, and soybean oil: these each run moderate and add to the vinegar, though none alone would push the roll this high.

What you put inside the sub still matters more than the roll itself.

This rating comes from Firehouse Subs' own published ingredient statement, read on August 11, 2026. Restaurant recipes vary by location and change over time, so always check the current listing: source 1, source 2. How we rate foods →

Firehouse Subs Large White Sub Roll and Firehouse Subs 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.