Blue cheese is generally safe to eat on a gluten-free diet. While the mold used to make blue cheese is sometimes grown on bread or other gluten-containing grains, testing shows that the finished cheese contains less than 5 parts per million (ppm) of gluten, well under the 20 ppm threshold that defines “gluten-free” under FDA regulations.
Why Blue Cheese Raises Questions
The distinctive veins running through blue cheese come from specific mold strains, most commonly Penicillium roqueforti. Cheesemakers traditionally grow these mold cultures on bread made from wheat or rye before introducing them into the cheese. That connection to wheat and rye is what raises red flags for people avoiding gluten, and it’s fueled years of debate in the celiac community.
The key detail is how little of that bread-based culture actually ends up in the final product. The mold itself doesn’t contain gluten. It simply uses the bread as a growing medium, and only a tiny amount of the culture gets added to a large volume of cheese. Testing by the Canadian Celiac Association found gluten levels below 5 ppm in blue cheeses made with mold grown on gluten-containing materials. That’s one-quarter of the safe threshold recognized by the FDA and international celiac organizations.
What the FDA Standard Means
The FDA defines “gluten-free” as containing fewer than 20 ppm of gluten. This threshold applies to all foods, including fermented products like cheese. A rule issued in 2020 specifically addressed how fermented and hydrolyzed foods, cheese among them, must demonstrate compliance with gluten-free labeling requirements. The definition itself didn’t change, but the rule clarified that manufacturers of these products need to verify their claims.
At under 5 ppm, plain blue cheese falls comfortably within this standard, even when the mold was cultured on wheat or rye bread. The National Celiac Association considers blue cheese unlikely to exceed 20 ppm based on available testing data.
When Blue Cheese Could Be a Problem
Plain blue cheese from a wedge or crumble is one thing. Processed blue cheese products are another. Blue cheese dressings, dips, sauces, and spreads can contain gluten from added thickeners, malt vinegar, or other ingredients that have nothing to do with the cheese itself. Always check the ingredient list on these products for wheat, barley, rye, or malt.
Some blue cheeses also add ingredients beyond the basics of milk, salt, enzymes, and mold culture. If wheat, barley, or rye appears on the label of the cheese itself, skip it. This is uncommon with plain blue cheese but worth checking, especially with flavored or specialty varieties.
Choosing Blue Cheese on a Gluten-Free Diet
For plain blue cheese like Roquefort, Gorgonzola, Stilton, or Danish Blue, gluten content is not a practical concern for most people with celiac disease or gluten sensitivity. A few habits will keep you safe:
- Read ingredient labels on any blue cheese product, especially dressings, crumbles with added seasonings, and pre-made dips.
- Look for “gluten-free” labeling when buying processed blue cheese products. This tells you the manufacturer has verified compliance with the FDA’s 20 ppm standard.
- Watch for cross-contact at restaurants, where blue cheese might be crumbled onto dishes prepared alongside breaded items or served with crackers on shared surfaces.
If you’re highly sensitive and want extra assurance, some cheesemakers now grow their mold cultures on gluten-free media like rice instead of bread. These products are sometimes marketed specifically to the gluten-free community, though plain blue cheese made the traditional way still tests well below the safety threshold.