Borage

Borage — used as both an herb and a leafy vegetable — doesn't have established histamine-raising characteristics.

• Fresh herb category — like most fresh herbs, borage is unfermented and unaged, keeping it in the lower-risk zone for histamine

• Less common ingredient — because borage isn't widely studied in histamine intolerance research specifically, there's less data than for more common foods, but no known red flags exist

It's generally considered a safe fresh green, though personal responses can always vary.