No, bananas are not high in histamine. However, they are thought to be “histamine liberators,” a term used to refer to foods or beverages which are believed to cause the release of histamine in your body when you consume them (although not containing high levels themselves). This means that bananas of all types should be avoided in the first month or so of a low histamine diet.
So-called high histamine banana category includes green bananas, merely unripe bananas, fully & overly ripe bananas, green banana flour, and plantains of all types (maduros and verdes). Other foods in the category of “histamine liberator” include: pineapples, strawberries, peanuts, and green beans.