Ascorbic acid (vit. C synthetic)
boric acid
Boric acid is not a commonly consumed food.
Unsuitable
This food is often poorly tolerated with histamine intolerance.
Boric acid (borax) is a chemical compound that is used as an insecticide or antiseptic. It is not intended for consumption and may be toxic if ingested. In the context of histamine intolerance, it is not relevant as a food.
Safer alternatives
Suitable
Folic acid
L-ascorbic acid (E300)