Is Firehouse Subs Cheddar Cheese High in Histamine?

Firehouse Subs Cheddar Cheese

High histamine

Cheddar cheese is high in histamine because it is an aged 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 straightforward cheddar made from pasteurized milk, cheese culture, salt, enzymes, and annatto for color.

Aged cheese — cheddar is aged, and aging is exactly what builds histamine in cheese, so it lands high on its own.
Not a dairy issue — the milk itself is not the problem here; fresh dairy tends to be low, and it is the aging step that pushes cheddar up.

Skipping the cheddar, or choosing a sub with fresh mozzarella if offered, keeps things lower.

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 Cheddar 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.