Do BPA and bisphenol alternatives cause or worsen thyroid disease?

What's actually in it

Bisphenols are in food can linings, plastic food containers, receipt paper, and water pipes. BPA is still used in many products. BPS and BPF, its replacements, are now in most BPA-free plastics. All three have similar chemical structures and similar effects on hormone pathways.

The thyroid gland is particularly sensitive to bisphenols because these chemicals compete with thyroid hormones for binding sites on transport proteins and thyroid receptors. They can reduce how much thyroid hormone actually reaches cells even when production levels look normal.

What the research says

A 2026 review of bisphenol A and its analogues in thyroid diseases found evidence from human studies linking higher bisphenol levels to thyroid dysfunction, including reduced T3 and T4 levels, elevated TSH (suggesting hypothyroidism), and higher rates of autoimmune thyroid conditions like Hashimoto's thyroiditis.

The review found these effects with BPA and with the replacement chemicals, confirming the pattern isn't limited to the original compound. BPS had particularly strong associations with thyroid antibody levels, suggesting it may trigger autoimmune responses.

Switching to glass, stainless steel, and ceramic food containers eliminates bisphenol exposure from the kitchen, which is the largest daily source for most people.