Is Firehouse Subs Mozzarella Cheese High in Histamine?

Firehouse Subs Mozzarella Cheese

Low histamine

This mozzarella is low in histamine because it is a fresh, unaged cheese.

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.

Dairy

This is a simple part-skim mozzarella made from pasteurized milk, cheese culture, salt, and enzymes.

Fresh dairy stays low — unlike aged cheeses such as cheddar or parmesan, mozzarella is not aged, so it does not build up histamine the way hard cheeses do.
Nothing else pushes it up — the milk, culture, and salt are all gentle, so this is one of the calmer cheese options on the menu.

A fresh mozzarella is a friendly pick if you want cheese on your sub.

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 Mozzarella Cheese 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.