Is Subway Sweet Onion Teriyaki Sauce High in Histamine?

Subway Sweet Onion Teriyaki Sauce

High histamine

Subway's sweet onion teriyaki is high in histamine from soy sauce and tomato paste.

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 Histamine Liberator

This sweet sauce blends sugar, vinegars, soy sauce, wheat, soybeans, tomato paste, and yeast extract.

Soy sauce and yeast extract lead — the soy sauce is fermented and high, and the autolyzed yeast extract is high too, which is enough to set this sauce high on its own.
Tomato paste adds more — tomato is a histamine liberator, so the tomato paste pushes it further, alongside the moderate rice vinegar and wheat.

For a lower-histamine sub, a plain oil dressing skips all of these.

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 Sweet Onion Teriyaki Sauce 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.