What does “gluten free” on a label actually mean — is it completely gluten free?
Short answer
Not quite — but close enough to trust in most cases. No food is literally zero gluten. In regulated markets, “gluten free” is a legal claim that means 20 parts per million (ppm) of gluten or less — the level shown, after years of scientific review, not to cause measurable harm for the vast majority of people with coeliac disease.
When you’re newly diagnosed, “gluten free” can feel like a promise you’re not quite sure you can lean on. Here is exactly what those two words guarantee — and what they don’t.
Where the 20 ppm figure comes from
The 20 ppm threshold wasn’t plucked out of the air, and it isn’t a compromise born of commercial convenience. It was set through the Codex Alimentarius — the international food-standards body — after extensive toxicological review, and it reflects genuine evidence. Large studies support the finding that consistent exposure below 20 ppm does not cause intestinal damage in most people with coeliac disease. In practice, a product this low is a reliable choice for daily eating.
The same words, slightly different rules by country
The claim is legally defined wherever you shop, but the exact wording and strictness vary by market — which is why labelling is best read with your destination in mind.
| Market | “Gluten free” threshold | Worth knowing |
|---|---|---|
| EU & UK | ≤ 20 ppm | Codex-based; applies to any product using the claim, symbol or not. |
| United States (FDA) | < 20 ppm | Same figure, but the rule leans on wheat — watch barley-derived malt. |
| Canada | ≤ 20 ppm | Similar standard; national oats guidance is more cautious. |
| Australia & New Zealand | No detectable gluten | Stricter than 20 ppm; a separate “low gluten” tier sits at ≤ 20 ppm. |
What the label promises — and what it doesn’t
For branded products in regulated markets, “gluten free” is a claim you can rely on. What it does not promise is that every single batch is individually tested, or that a small unregulated producer or market stall applies the same rigour. That is where a little extra care earns its keep: read the ingredients on unfamiliar brands, and trust the label less when there is no formal claim behind it.
The everyday takeaway is simple: look for the words “gluten free” or the crossed-grain symbol. Both mean the 20 ppm standard applies.
The bottom line
“Gluten free” isn’t zero gluten — it’s 20 ppm or less, a level backed by real science rather than convenience. In regulated markets it’s a claim you can lean on; with unfamiliar or uncertified products, read the ingredients and let the label carry less of the weight.
Where to go next
- How to read what a label really promises: Reading Food Labels.
- What that precautionary line means: “May contain gluten” — can I eat it?
- The certification mark explained: The crossed-grain symbol.
- Back to the full set: Gluten-Free Label Reading FAQ.
Sources: Coeliac UK (gluten-free labelling guidance); Codex Alimentarius gluten-free standard (≤20 ppm); U.S. FDA gluten-free labeling rule; Food Standards Australia New Zealand; AOECS. General information, not individual medical advice.
Last verified: 2026-07-20.
Reviewed against the HTGF methodology — every claim sourced, every listing tiered and dated. This article is practical guidance, not medical advice.
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