Can BPA replacements in products increase breast cancer risk?

What's actually in it

After BPA got bad press, manufacturers switched to replacements like BPAF (bisphenol AF), BPS, and BPF. You'll find these in water bottles, food containers, thermal receipt paper, and can linings. Products labeled "BPA-free" often contain one of these alternatives instead.

The problem is that these replacements have similar chemical structures to BPA. They were chosen because they do the same job in plastics, but that also means they can interact with the same hormone receptors in your body.

What the research says

A 2026 study in Adv Sci tested whether BPAF, one of the most common BPA substitutes, could promote breast cancer. The results were alarming.

BPAF binds to the progesterone receptor, a hormone receptor that plays a central role in breast tissue growth. When BPAF activated this receptor, it turned on genes that drive breast cancer cell proliferation.

In lab tests, BPAF made breast cancer cells grow faster and resist cell death. The effect was strong enough that the researchers compared it to the effect of actual progesterone, your body's natural hormone.

BPA itself doesn't bind to the progesterone receptor as strongly as BPAF does. So in this specific cancer pathway, the replacement may actually be worse than the original chemical it was designed to replace. "BPA-free" doesn't mean safe.