Acesulfame K
caramel
May contain added sugar, caramelized products can be problematic.
Caution
May cause symptoms in more sensitive people. Track your own reaction.
Caramel itself (sugar heated until brown) should not contain histamine. However, the problem can be the quality of the sugar, any additives or the caramelization process, which can cause a reaction in sensitive individuals.
Safer alternatives
Suitable
Copper
Dextrose
The pure form of dextrose does not contain histamine.