Is BPS (the main BPA replacement in plastic) safe for your brain?

What's actually in it

BPS (bisphenol S) is the chemical most commonly used to replace BPA in plastics labeled "BPA-free." It's in food containers, water bottles, sippy cups, canned food liners, and thermal paper receipts. Like BPA, it migrates into food and is absorbed through skin from receipts.

BPS was initially considered a safer alternative because it's chemically more stable. But more stability means it's also harder for your body to clear.

What the research says

A 2026 review in Neurotoxicology and Teratology compiled research on BPS and neurological health. The findings undercut the "safer alternative" narrative: BPS disrupts neurotransmitter systems, synaptic signaling, and neuroinflammatory pathways in the brain.

BPS causes similar neurotoxic effects to BPA through estrogen receptor activation, with some studies finding BPS is more potent at lower doses in certain neural pathways. It also causes unique neurological effects through non-estrogen mechanisms, including disruption of dopamine signaling and serotonin metabolism.

In animal studies, BPS exposure during development caused anxiety-like behavior, memory impairment, and social behavior changes. These are the same types of outcomes linked to BPA, which is why regulators are starting to regulate bisphenols as a class rather than one at a time. The practical takeaway: "BPA-free" doesn't mean brain-safe.