Is it safe to cook acidic foods in stainless steel pans?
Yes. Stainless steel is one of the safest materials for cooking acidic foods. Very small amounts of nickel and chromium can leach from lower-grade stainless steel, but food-grade 304 stainless shows minimal migration.
What's actually in it
Food-grade stainless steel (grade 304) contains chromium (18%) and nickel (8-10%) alloyed with iron. The chromium creates a passive oxide layer that resists corrosion and prevents most metal migration into food. The passivation layer is self-repairing when damaged and remains effective across normal cooking conditions, including contact with acidic foods like tomatoes, citrus, and vinegar.
Grade 316 stainless (also called marine grade) has added molybdenum for even better corrosion resistance and is used in surgical applications. Both grades are appropriate for cooking.
What the research says
Research on metal migration from stainless steel cookware found that food-grade stainless steel shows very low migration of nickel and chromium into food under normal cooking conditions. Migration is higher in new pans (which have not yet formed a full passive oxide layer) and with prolonged cooking of highly acidic foods, but remains well within established safety limits for healthy adults.
People with confirmed nickel allergy should be aware that nickel can leach in small amounts, particularly with very acidic foods or new stainless pans. For most people, stainless steel is an excellent, safe choice that is far preferable to nonstick pans from a chemical exposure perspective.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Metal migration from stainless steel cookware | Food Chem Toxicol | 2026 |
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