Is Firehouse Subs Lemon Cookie High in Histamine?

Firehouse Subs Lemon Cookie

High histamine

This lemon cookie is high in histamine, driven by the lemon oil and white chocolate.

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.

This is a soft cookie made from wheat flour, sugar, white chocolate chips, margarine, butter, eggs, and lemon oil.

Lemon oil and white chocolate — the lemon is a classic liberator and the white chocolate chips are high, so together they set the rating.
Wheat flour and margarine — the enriched wheat flour and margarine add moderate histamine on top of the lemon and chocolate.

There is no simple tweak here, so a fresh piece of fruit like apple would be a lower-histamine sweet finish.

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 Lemon Cookie 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.