Tomato: histamine content (0.25 mg/100 g)

0.25 mg/100 g

Reported range 0.25–1.71 mg per 100 g. Concentrations vary with ripeness, storage and processing, so a single figure would be misleading.

By portion

Portion	Grams	Histamine
1 medium	123 g	0.31 mg
1 cup chopped	180 g	0.45 mg

Source

“Tomato: mean 2.51 mg/kg, maximum 17.07 mg/kg”

Low-Histamine Diets: Is the Exclusion of Foods Justified by Their Histamine Content? (Nutrients 2021;13(5):1395) · 2021 · CC BY 4.0

Also tracked for this food: oxalate

Food composition data, not medical advice. Reported tolerance thresholds vary widely between individuals, so a value being high here does not mean you will react to it.