BPA Damages DNA in Thyroid Cells at High Doses

BPA causes DNA damage in thyroid cells. And the doses that did the most damage are challenging what regulators consider "safe."

What the Study Found

A 2026 study in the Journal of Applied Toxicology exposed thyroid cells to bisphenol A at different concentrations. BPA caused DNA damage and differential cytotoxicity across thyroid cell types. At higher doses, the damage was severe enough to challenge current regulatory thresholds for safe exposure.

DNA damage in thyroid cells is a big deal. The thyroid controls metabolism, energy, and development. DNA damage in these cells can lead to mutations, and thyroid cancer rates have been rising for decades.

The Safety Limit Problem

Regulators set "tolerable daily intake" levels for BPA based on older data. This study found effects at doses that call those limits into question. If the "safe" level isn't actually safe, millions of people are being overexposed every day.

BPA has already been linked to thyroid cancer in epidemiological studies. Now we're seeing the mechanism: direct DNA damage to the cells.

What You Can Do

Reduce BPA exposure wherever possible. Avoid canned foods, plastic food containers, and thermal receipt paper. Use glass and stainless steel. Choose "bisphenol-free" (not just "BPA-free") products when available.

Browse our non-toxic home essentials for safer options.

Also see non-toxic kitchen essentials for safer alternatives.

Source: Bó IFD, Bufalo NE, Máximo V, Ward LS (2026). J Appl Toxicol.