Cast Iron Skillet vs. Stainless Steel Pan

Cast iron and stainless steel are both coating-free cookware options with strong safety profiles. Cast iron is a single-material pan seasoned with oil; stainless steel is a chromium-nickel alloy that forms a passive oxide layer making it highly resistant to corrosion and leaching. Neither uses PTFE or PFAS coatings, so there are no synthetic polymer concerns with either.

The main safety nuance is what each metal leaches. Cast iron adds small amounts of dietary iron to food — helpful for many people, but something those with hemochromatosis should consider. Stainless steel can leach trace amounts of nickel and chromium, particularly when cooking acidic foods for extended periods. High-quality 18/10 stainless leaches very little under normal cooking conditions, but it is a consideration for people with nickel sensitivity.

For everyday cooking, stainless steel rated 'better' rather than 'best' reflects this nickel leaching concern, not any coating risk. Cast iron edges it out on purity since iron is an essential nutrient rather than a heavy metal. That said, both are far safer than any coated cookware, and stainless steel is more versatile for acidic dishes like tomato sauces. Choose cast iron for high-heat searing and baking; choose stainless for sauces, boiling, and acid-based cooking.