Are BPF and BPS in BPA-free products just as estrogenic as BPA?

What's actually in it

When BPA was phased out of products due to its estrogen-mimicking effects, manufacturers replaced it with BPF (bisphenol F) and BPS (bisphenol S). These chemicals have the same core structure as BPA: two phenol rings linked together. The phenol ring structure is exactly what allows bisphenols to fit into estrogen receptors in the body.

The only meaningful differences between BPA, BPF, and BPS are minor chemical modifications that don't change their estrogen receptor binding ability.

What the research says

A 2026 study in Toxics analyzed the molecular interaction of BPF and BPS with estrogen receptors using structural insights. They found that BPF and BPS interact with estrogen receptors in structurally comparable ways to BPA. The binding affinity was similar. The hormone disruption mechanism was essentially the same chemical process.

"BPA-free" labeling has no regulatory requirement to use less estrogenic alternatives. It only means no BPA specifically.

The only way out of the bisphenol problem is to avoid plastic food contact altogether. Glass food storage uses no bisphenols in any form, not BPA, BPF, or BPS.