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Sonic Smasher Sauce

High histamine

Sonic's Smasher Sauce is high in histamine because of its mustard, tomato paste, hot sauce, and tamarind.

Fast food is cooked in batches and held warm rather than made when you order it, so it is rarely as fresh as something cooked at home. That matters here because histamine builds up as protein foods sit, which means the same item can affect you differently depending on how long it waited.

Histamine Liberator

This creamy burger sauce blends soybean oil, egg yolks, mustard, tomato paste, vinegar, hot sauce, molasses, and tamarind extract, and several of those run high.

  • Mustard, tomato paste, and hot sauce lead the concern — salad mustard and hot sauce are both high, and the tomato paste is a classic liberator, so together they set the level here.

  • Tamarind, vinegar, and molasses add to it — the tamarind extract is high, while the vinegar and molasses sit at moderate, keeping the whole sauce firmly in high territory.

Since the drivers are baked into the sauce itself, the cleaner move is to skip it and choose a plainer topping.

What's in it

This is a restaurant menu item, so its rating comes from its ingredients. Here is what it is typically made of and where the histamine sits. Tap any whole food for the full detail.

This rating comes from Sonic's own published ingredient statement, read on August 23, 2026. Restaurant recipes vary by location and change over time, so always check the current listing: source 1, source 2. How we rate foods →

Sonic Smasher Sauce and Sonic 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.

Related foods

Other high-histamine restaurant foods.

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Learn more

Foods With High Histamine Levels Why Freshness Matters More Than Food Lists Why Leftovers Can Trigger Histamine Symptoms What Are Histamine Liberators?

For educational purposes only. Not medical advice. Consult a healthcare professional for personal guidance.

References

  1. SIGHI Food Compatibility List — SIGHI (2026)
  2. Histamine and histamine intolerance — Maintz & Novak (2007)
  3. Histamine Intolerance: The Current State of the Art — Comas-Basté et al. (2020)
  4. Low-Histamine Diets: Is the Exclusion of Foods Justified by Their Histamine Content? — Sánchez-Pérez et al. (2021)
  5. Histamine Intolerance: Symptoms, Diagnosis, and Beyond — Jochum (2024)
  6. Guideline on management of suspected adverse reactions to ingested histamine — Reese et al. (2021)