Is Sonic Sweet Pickle Relish High in Histamine?

Sonic Sweet Pickle Relish

High histamine

Sonic's sweet pickle relish is high in histamine because it is made from pickled cucumbers.

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.

This is chopped cucumber that has been pickled with sugar, vinegar, salt, and spices.

Pickled cucumber — the cucumbers are pickled and the relish itself lands high, since pickling builds up histamine as the cucumbers cure in brine.
Vinegar on top — the vinegar in the mix adds a moderate note of its own, so both the pickle and the brine are working against you here.

Skipping the relish is the easiest way to drop this from your order.

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 Sweet Pickle Relish 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.