Mayonnaise vs Mustard:
Which Is Gluten-Free?
Two sandwich staples that are usually safe. Both are typically gluten-free; the risk is specialty varieties and cross-contact from shared knives.
Mayonnaise is the safer celiac choice — Mayonnaise is gluten-free, while Mustard depends on the brand or preparation.
Verdicts last reviewed July 2026 · based on FDA gluten-free labeling rules and Celiac Disease Foundation guidance
Mayonnaise is the safer celiac choice — Mayonnaise is gluten-free, while Mustard depends on the brand or preparation.
Mayonnaise
Yes, most mayonnaise is gluten-free. Mayo is made from eggs, oil, and vinegar or lemon juice — all naturally gluten-free ingredients.
Watch out for:
- Very rare: specialty mayo with wheat-based seasonings
- Restaurant cross-contamination from sandwich prep
- Some "mayo" alternatives or spreads may contain gluten
Mustard
Most yellow mustard is gluten-free. Watch for wheat flour in some Dijon mustards and specialty mustards that may use beer or malt vinegar.
Watch out for:
- Some Dijon mustards use wheat flour
- Beer mustard contains barley
- Honey mustard dressings may contain wheat
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