Is Your Lead-Glazed Pottery Cookware Safe?
NonToxCo Research
Science & Safety Team · 3/29/2026
The Acid Test
Cooking acidic food in traditional lead-glazed pottery is essentially a recipe for heavy metal ingestion. A 2026 study found that acidic dishes, like those using tomatoes or citrus, leach 9x more lead from glazed ceramics than non-acidic foods.
Researchers tested 33 items and found that 7 out of 8 pieces failed to meet basic safety standards for lead leaching. When acidic food was prepared in these vessels, the median lead concentration hit 103.4 mg/kg. For context, eating just a single portion of food prepared this way can cause a measurable spike in your blood lead levels.
Why It Matters
Lead is a potent neurotoxin with no safe level of exposure. The glazing process in traditional pottery often uses lead to create a smooth, shiny finish, but that finish breaks down under heat and acidity. You cannot see the lead leaching into your sauce, but it is there.
If you have decorative pottery in your kitchen, keep it on the shelf. If you are cooking, stick to materials that don't off-gas or leach heavy metals into your dinner. We have curated a collection of non-toxic kitchen alternatives that perform better and keep your food free from toxic additives. It is time to clear the lead out of your kitchen cabinet.