buckwheat flour
Wheat spelt flour
It may contain gluten, which some people cannot tolerate.
Caution
May cause symptoms in more sensitive people. Track your own reaction.
Freshly baked bread made from unleavened wheat or spelled flour is low in histamine. The method of preparation (yeast) is problematic, not the flour itself.
Safer alternatives
Suitable
Rice flour
Low histamine content, well tolerated.Potato dumpling
Potatoes are low-histamine, and so is flour.