GF Product Reviews: Why 20 ppm Doesn't Mean Safe for Everyone

There's a common misconception that a 'gluten-free' label means the product is completely free of gluten. That's wrong. The FDA's rule, in place since 2013, allows foods labeled 'gluten-free' to contain up to 20 parts per million (ppm) of gluten (FDA gluten-free rule). That's the threshold regulators chose because it's the lowest level that can be reliably detected with validated methods and is tolerated by most people with celiac disease (FDA gluten-free rule). But 'most' isn't 'all.' For a working practitioner who reviews GF products for a living, 20 ppm is a starting point, not a safety guarantee.

The 20 ppm Myth: Why We Don't Trust the Label Alone

When we evaluate a product, the first thing we do is ignore the big 'Gluten-Free' banner and read the ingredients. Then we check for certifications. The FDA rule applies to foods under its jurisdiction, but not to meat, poultry, some egg products, or most alcoholic beverages (NIDDK Eating, Diet, & Nutrition). That means a USDA-regulated hot dog could be labeled 'gluten-free' without meeting the same standard. And even naturally gluten-free grains like rice or quinoa can become contaminated during harvesting or milling (Celiac Disease Foundation). So a label is no substitute for sourcing. We look for third-party certifications like the Gluten-Free Certification Organization (GFCO) or a brand's explicit statement about testing. But certification isn't everything either—it's just one layer of diligence.

What We Actually Look For in a GF Product

Our review protocol starts with the ingredients list. We avoid anything with wheat, barley, rye, or triticale (FDA gluten-free rule). Then we look for hidden sources of gluten, like modified food starch or malt flavoring (NIDDK Treatment). We also check for oats. Oats are naturally gluten-free, but they're frequently cross-contaminated with wheat, barley, or rye (Celiac Disease Foundation). Some people with celiac disease react to avenin, a protein in oats similar to gluten, so we recommend certified gluten-free oats—or better yet, oat-free products for the most sensitive folks (Celiac Disease Foundation). Next, we consider the manufacturing environment. Cross-contact can happen at any point from farm to table (NIDDK Eating, Diet, & Nutrition). We ask brands about their testing protocols and whether they use dedicated facilities. Finally, we look at nutrition. Packaged GF foods tend to cost more and some are higher in fat and sugar (NIDDK Eating, Diet, & Nutrition). We're not just reviewing for safety—we're reviewing for whether this product is actually worth your money.

The Counterargument: 'But 20 ppm Is Safe for Everyone'

You might argue that the 20 ppm threshold is backed by science and is considered safe for most people with celiac disease. That's true—but 'most' is not 'all.' The FDA itself says the threshold is tolerated by most, not everyone (FDA gluten-free rule). And international standards align: Codex, Health Canada, and the EU all use 20 ppm as their limit (Health Canada / Codex gluten-free threshold; EU gluten-free regulation). However, the EU has a separate 'very low gluten' category at 100 ppm, which acknowledges that some people may tolerate higher levels, but it's not the same as 'gluten-free.' The point is that thresholds are set for population-level risk, not individual safety. For someone with refractory celiac disease, a rare condition where symptoms continue even on a strict GF diet, even 20 ppm might provoke a reaction (NIDDK Treatment). So while 20 ppm is a reasonable regulatory limit, we as reviewers have to go beyond it to identify products that are truly safe for the most sensitive consumers.

Our Recommendation: How to Choose a GF Product

So what's our take? We recommend that people with celiac disease—especially those who are newly diagnosed or have ongoing symptoms—choose products that are certified gluten-free and made in dedicated facilities whenever possible. For example, we reviewed a popular brand of GF pasta that boasts a 'gluten-free' label but is made on shared lines with wheat. We wouldn't recommend that for a client who is highly sensitive. In contrast, a brand that uses certified GF oats and tests every batch to below 5 ppm earns our top rating. For the general population without celiac disease, the 20 ppm rule is fine. But for anyone with an autoimmune condition, we advise erring on the side of caution. And remember: if you're considering a GF diet for weight loss or general health, there's no evidence it promotes better health or weight loss (NIDDK Eating, Diet, & Nutrition). So don't switch unless you need to.

Quick tip: When in doubt, call the manufacturer. The FDA says if a label doesn't tell you what's in a product, ask the company for an ingredients list—you can't assume it's GF (NIDDK Treatment).

Sources

• FDA gluten-free rule - https://www.fda.gov/food/nutrition-education-resources-materials/gluten-and-food-labeling
• Celiac Disease Foundation - https://celiac.org
• NIDDK Eating, Diet, & Nutrition - https://www.niddk.nih.gov/health-information/digestive-diseases/celiac-disease/eating-diet-nutrition
• NIDDK Treatment - https://www.niddk.nih.gov/health-information/digestive-diseases/celiac-disease/treatment
• Health Canada / Codex gluten-free threshold - https://www.mcmasterceliacclinic.ca/gluten-free-labeling
• EU gluten-free regulation - https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32014R0828