Is Stainless Steel Cookware Safe? Nickel, Chromium, 18/10 and What the Research Shows

Stainless steel is usually the answer people land on after reading about nonstick coatings: no PTFE, no PFAS, nothing to scratch off. But stainless is an alloy of iron, chromium and nickel, and small amounts of those metals do move into food, especially acidic food cooked for a long time. This guide explains what stainless cookware is made of, what the best-known study actually measured, how those amounts compare with official safety limits, who should pay attention (mainly people with a nickel allergy), and the simple habits that keep the amounts low.

What stainless steel cookware is made of

Stainless steel is iron alloyed with at least about 10.5% chromium. The chromium forms a thin, self-healing oxide film on the surface, which is what keeps the steel from rusting and makes it non-reactive for everyday cooking. Most cookware adds nickel for extra corrosion resistance and shine.

In fully clad cookware, the stainless is the inside and outside skin, and the aluminum or copper core is sealed between the layers, so food never touches the core. Capital Cookware's All-Clad D3 listings describe the build as 18/10 stainless steel, aluminum and magnetic stainless steel, with an 18/10 cooking surface that is "non-reactive, preserving food's natural flavors." The magnetic outer layer is what makes the pan work on induction.

Does stainless steel leach into food? What the research measured

The study most often cited is Kamerud, Hobbie and Anderson (2013), "Stainless Steel Leaches Nickel and Chromium into Foods During Cooking", published in the *Journal of Agricultural and Food Chemistry*. Researchers at Oregon State University cooked tomato sauce, an acidic food, with samples of three stainless steel grades and in a stainless saucepan, then measured nickel and chromium in the sauce.

Three takeaways matter for home cooks. New stainless releases the most metal; the amount drops a lot after the first several uses. Time matters: the big numbers come from 6- and 20-hour simmers of an acidic sauce, far longer than most cooking. And acid drives it: tomato sauce is a worst case. Quick jobs like searing, sautéing vegetables or boiling pasta water expose the steel to far less.

How much is too much? Putting the numbers in context

The European Food Safety Authority's 2020 opinion on nickel in food set a tolerable daily intake (TDI) of 13 µg of nickel per kg of body weight per day for long-term exposure. For a 70 kg (154 lb) adult, that is about 910 µg a day. The 88 µg per serving that the study measured from a broken-in pan after a 6-hour tomato simmer is roughly a tenth of that adult limit (our arithmetic, not the study's). EFSA found that typical adult diets are below the TDI, while some young children's diets can exceed it, and it flagged acute exposure as a concern for people who are already nickel-sensitized, where oral nickel can trigger eczema flare-ups (systemic contact dermatitis).

Chromium in food is mainly trivalent chromium, which the NIH Office of Dietary Supplements describes as a trace mineral found in many foods, with adequate intakes for adults of about 25 µg a day for women and 35 µg for men aged 19 to 50. Hexavalent chromium, the toxic form linked to industrial pollution, is a different compound. The study measured total chromium and did not identify its form.

Put simply: for most people, stainless cookware adds a small amount of nickel and chromium to a diet that already contains both. For people with a nickel allergy, the extra nickel from long acidic simmers can be worth avoiding.

Who should be careful with stainless steel

• People with a nickel allergy or systemic nickel sensitivity. This is the group the research points to. If a dermatologist has suggested a low-nickel diet, ask whether to avoid long simmers of acidic foods in nickel-containing stainless.
• Anyone cooking for small children who simmers acidic food for hours. EFSA's concern for young age groups was about total diet; avoiding all-day tomato sauces in a brand-new pan is an easy way to keep the contribution low.
• Everyone else: stainless is fine for everyday cooking. The habits below keep leaching low without changing how you cook.

How to keep metal leaching low (without giving up stainless)

1. 1Break in a new pan. The study found new steel released the most metal and the amount stabilized after about six long cooks. Cooking normally for a few weeks does the same thing; there is nothing special to buy.
2. 2Keep long acidic simmers short or in another pot. For all-day tomato sauces, chili or wine braises, a nickel-sensitive cook can use enameled cast iron or a nonstick pot; quick tomato pan sauces are a much smaller exposure.
3. 3Do not store food in the pan. Move leftovers, especially acidic ones, into glass or plastic containers instead of leaving them in the pan overnight.
4. 4Add salt after water boils. All-Clad's care advice is to add salt to boiling water, not cold, to avoid pitting: small pits in the cooking surface that are cosmetic but permanent.
5. 5Clean with non-chlorine cleaners and rinse well. Bleach and chlorine cleaners can pit stainless. Bar Keepers Friend (oxalic acid) is fine on stainless; rinse thoroughly afterwards.

Day-to-day cleaning is covered in how to clean stainless steel pans, and the oil-and-preheat routine that stops sticking is in how to cook on stainless steel without sticking.

Scratches, rainbow stains and white spots: are they safe?

This is the main safety difference from nonstick. A scratched nonstick pan has a damaged coating; a scratched stainless pan is still solid stainless. Removing discoloration from stainless covers heat tint and white spots in detail.

Stainless steel vs nonstick, cast iron, aluminum and ceramic: safety compared

No material is perfect for everything, which is why most kitchens end up with stainless for searing, sauces and the oven, plus one nonstick pan for eggs. Stainless steel vs nonstick explains which jobs go to which pan, and is nonstick cookware safe? covers PTFE, PFOA and safe temperatures. For bare and hard anodized aluminum, see is aluminum cookware safe?.

Options if you need nickel-free cookware

• 18/0 stainless. Nickel-free and magnetic, so it works on induction, but it is less corrosion resistant than 18/10 and is mostly used for budget pans and for the outside layer of clad cookware. Capital Cookware's All-Clad lines all use an 18/10 cooking surface.
• Hard anodized nonstick. The cooking surface is a PTFE coating over sealed anodized aluminum, so food does not touch nickel-containing steel. Options in stock on Oct 23: the HA1 Expert 10-inch fry pan ($49.99) and the HA1 10-piece set ($374.99), both listed to 500°F. Use them at low to medium heat.
• Enameled cast iron or glass for long acidic simmers, if your dermatologist recommends avoiding nickel.

Many people with a nickel allergy keep using stainless for quick cooking and switch pans only for long, acidic dishes. That is a decision to make with your doctor.

Choosing safe, long-lasting stainless cookware

If you are buying stainless, look for a fully clad build (the core runs up the walls, not just a disc on the bottom), an 18/10 cooking surface, riveted stainless handles and a high oven rating. Those are the same features that make a pan cook well. Our stainless steel cookware buying guide covers each one, and the set buying guide compares sets by price per useful pan.

Prices change and pieces sell out, so check the listing before you buy. A note on dishwashers: All-Clad's care chart says to hand wash D3, D5 and Copper Core; see is All-Clad dishwasher safe?.

Who this guide is for, and who can skip it

• For you if you are choosing between stainless and nonstick on safety grounds, have a nickel allergy, or saw a headline about stainless "leaching" and want the actual numbers.
• Skip it if you want to know which pan to use for which job; read stainless steel vs nonstick instead.

Verdict

Stainless steel cookware is safe for nearly everyone and is one of the safest surfaces you can cook on: no coating to overheat, scratch through or wear out, and no upper heat limit you are likely to reach on a stove. It does release small amounts of nickel and chromium, most from new pans and long acidic simmers, and that amount falls quickly as the pan is used. If you have a nickel allergy, keep all-day tomato sauces out of stainless and talk to your dermatologist. For everyone else, a fully clad 18/10 pan is a safe buy that should last decades.