Isomalt

Isomalt is notable for FODMAPs, sorbitol and nickel. Clear on histamine, tyramine, salicylate, sucrose, lactose, oligosaccharides, fructose, oxalates and gluten.

Yes — Isomalt is high in FODMAPs. Isomalt is the polyol of hard sweets and lozenges, chosen because it resists heat without browning and does not draw moisture. It is absorbed less than maltitol, so more of it ferments - the trade-off for a mint that keeps its shape.

Yes — Isomalt is high in sorbitol. Isomalt is a polyol used mostly in hard sweets and lozenges, where it does not melt or brown. Same fermentation in the colon as sorbitol, same dose dependence.

Isomalt contains only low levels of nickel. Isomalt carries a trace of nickel for a reason written into the law that governs it. E 953 is made by CATALYTIC HYDROGENATION and the catalyst is nickel - the regulation says so in its own text - so its purity criteria carry a nickel limit of 2 mg/kg on the dry weight basis. That is a legal CEILING and not a content: what a given batch actually holds is not published, and 2 mg/kg is an order of magnitude below the foods that lead this axis. But a ceiling exists because a trace is expected. Amounts vary by brand and recipe, so always check the label of the exact product.