Caramel color can contain gluten, but most often does not. In Coke products, it does not.
Dextrose is sugar, so it is never gluten-containing. You might be confusing it with dextrin, which can be made of corn or wheat.
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I really don't like "Codex's definition of gluten-free". Even though it may contain 0.02% of gluten, there's still gluten in it. Oh well. It's fustrating enough.
Well, CODEX is what Europe goes by and they're miles ahead of us. Since the Europeans are not all experiencing continuing symptoms or villous atrophy on their standard, I think it's safe. And after all, we ALL get some miniscule bit of gluten. If you eat any food that's processed, there's going to be a tiny bit--just so little that it doesn't matter... like the CODEX standard.