BPA-Free Doesn’t Mean Safe: BPS, BPF and Regrettable Substitution
“BPA-free” might be the most reassuring phrase in the housewares aisle. It’s on sports bottles, kids’ cups, food containers, lunchboxes. It reads like a safety rating.
It isn’t one. It’s a statement about a single molecule, and it says nothing about what the manufacturer used instead.
Short answer: The common replacements, bisphenol S and bisphenol F, test as about as hormonally active as BPA in laboratory work. Europe stopped playing the one-molecule game in 2024: its food-contact regulation bans BPA outright and also prohibits other hazardous bisphenols, which catches BPS. The US position is different, and the simplest way out of the argument is to stop buying the question: steel or glass.
Two regulators, one molecule, opposite conclusions
The FDA’s stated position is short. Based on its most recent safety assessment, BPA is safe at the current levels occurring in foods. Polycarbonate baby bottles and sippy cups came off the approved list in 2012 and BPA epoxy left infant-formula packaging in 2013, and the agency is careful to say why: those were abandonment amendments, meaning the industry had stopped using it, and the FDA states plainly that such an amendment is not based on safety. BPA currently sits on its list of chemicals under review, with a food additive petition filed in 2022 still open.
Europe went the other way, hard. In April 2023, after assessing more than 800 studies published since 2013, EFSA cut its tolerable daily intake for BPA from 4 micrograms per kilogram of body weight to 0.2 nanograms. That’s roughly 20,000 times lower. The basis was an immune effect, a rise in a type of white blood cell in the spleen, and EFSA concluded that consumers at both average and high exposure, in every age group, exceed the new limit.
You can hold both of those in your head. One agency reads the same literature as reassuring and the other reads it as a reason to drop the limit by four orders of magnitude.
The replacement nobody checked first
Here’s the part that should change how you read the label. When manufacturers dropped BPA, the chemistry they reached for was its close relatives.
A 2015 review in Environmental Health Perspectives went through 32 studies of bisphenol S and bisphenol F and concluded that they are as hormonally active as BPA, with endocrine-disrupting effects in the same order of magnitude and of similar type: estrogenic, antiestrogenic, androgenic and antiandrogenic. BPS showed potencies similar to estradiol itself in some membrane-mediated pathways.
A 2020 review in Nutrients took it further, reporting that BPS produces equivalent obesogenic effects through different pathways, correlates with metabolic disorders that BPA didn’t, and is more toxic to the reproductive system. Its authors argued BPS should be regulated exactly like BPA.
That pattern has a name in the policy world: regrettable substitution. Ban one compound, watch the market move to its nearest structural cousin, start the research cycle over.
| Quick facts | Bisphenols in bottles |
|---|---|
| Where BPA was used | Polycarbonate bottles, cup liners, can coatings |
| Common replacements | BPS, BPF, and Tritan copolyester (a different chemistry) |
| EU status | BPA banned in food contact under Regulation 2024/3190; hazardous bisphenols including BPS also prohibited |
| US status | FDA says BPA is safe at current dietary levels; a 2022 petition is still under review |
| The honest shortcut | Stainless steel or glass sidesteps the whole question |
The study that ended up in court
In 2011, researchers published a paper in Environmental Health Perspectives reporting that almost all commercially available plastics they sampled leached chemicals with estrogenic activity, including products advertised as BPA free, and that in some cases the BPA-free products released more. They stressed the samples with microwaving, UV and autoclaving first.
Two things are true about that paper, and most write-ups give you only one.
The finding is real and it’s published. And the authors were employed by, or held stock in, the testing company that ran the assay and a company selling an alternative plastic, which the paper discloses. Eastman Chemical, which makes Tritan, sued over the advertising built on the work, and in 2014 the Fifth Circuit affirmed a jury verdict that the claims violated the Lanham Act, upholding an injunction against stating that Tritan leaches chemicals with significant estrogenic activity. The court’s line is worth quoting: advertisements do not become immune from scrutiny simply because their claims engage scientific debate. Separately, an industry-linked team reported that Tritan’s three monomers tested negative for estrogenic and androgenic activity across a battery of assays.
So the honest summary is messy. A court ruled on advertising, not on biology, and the two bodies of evidence that exist were each produced by people with something riding on the answer.
What Europe actually banned
Regulation (EU) 2024/3190 is the clearest regulatory statement anyone has made on this. Article 3 prohibits the use of BPA and its salts in food contact materials, with narrow exceptions for things like filtration membranes and large epoxy-coated tanks. Single-use articles had 18 months to comply, running to July 2026, and some categories have until January 2028.
Article 5 is the interesting part for anyone who remembers the BPA-to-BPS swap. It prohibits other bisphenols that carry harmonised classifications for reproductive toxicity, carcinogenicity or endocrine disruption, which covers bisphenol S. Rather than banning molecules one at a time while the market runs ahead, Europe wrote the rule at the family level.
California has been less decisive. BPA was added to the Prop 65 list in 2013, delisted, re-added in 2015 for female reproductive toxicity, and had the developmental endpoint reinstated in December 2020. Three listing decisions on one chemical in seven years tells you how contested this is.
So what do you actually buy?
If you want to stop tracking which bisphenol is in fashion, buy a bottle that has none of them: stainless steel or glass. That’s the reasoning behind every pick in our best non-toxic water bottles, and the two questions it raises instead, about steel and about aluminum liners, we’ve answered separately in is stainless steel safe and what’s inside an aluminum bottle.
If you’re keeping the plastic bottle you already own, which is a legitimate choice, keep it out of heat. Microwaving and sunlight are where plastics shed the most, and that’s the same mechanism behind the microplastics in bottled water. Replace it when it goes cloudy or scratched.
And treat the badge as what it is. “Free from” marketing tells you what was removed, never what went in instead, which is the whole trick covered in our greenwashing guide.
Frequently asked questions
Is BPA-free plastic safe?
It’s safer in the specific sense that one studied chemical is absent. The common replacements, BPS and BPF, were found in a 2015 review of 32 studies to be about as hormonally active as BPA, so “BPA-free” doesn’t tell you the plastic is free of hormone-active chemicals. Steel and glass avoid the question entirely.
What is BPS and is it worse than BPA?
BPS is bisphenol S, the most common BPA substitute. Reviews have found it similarly hormonally active, and a 2020 review reported it was more toxic to the reproductive system than BPA and correlated with metabolic disorders BPA wasn’t. Europe’s 2024 food-contact regulation prohibits hazardous bisphenols, which captures BPS.
Did the EU ban BPA in water bottles?
Yes. Regulation (EU) 2024/3190 prohibits BPA in food contact materials, with transition periods that began running from the end of 2024. It also prohibits other bisphenols classified as reproductive toxicants, carcinogens or endocrine disruptors, rather than banning them one at a time.
Is Tritan safe?
The honest answer is that the available evidence is contested and both sides have a financial interest. Industry-linked testing found its monomers negative for estrogenic and androgenic activity, and a separate academic group reported estrogenic activity from stressed Tritan samples before being enjoined from advertising that claim. If that uncertainty bothers you, steel or glass removes it.
Does heat make plastic bottles worse?
It does. The studies that found the highest releases of plastic particles used microwaving, sunlight and repeated mechanical stress, and bottle age mattered too. Whatever plastic you’re using, keeping it cool and out of direct sun is the single most useful habit.
Related reading
The rest of this series: is stainless steel safe, microplastics from plastic bottles, and aluminum bottles and their liners. For vetted picks, see the best non-toxic water bottles. We’ve also looked at the plastics in your kitchen.
Sources: US Food and Drug Administration, BPA use in food contact application. EFSA, Bisphenol A in food is a health risk, 2023. Rochester & Bolden, Environmental Health Perspectives, 2015. Thoene et al., Nutrients, 2020. Yang et al., Environmental Health Perspectives, 2011. Osimitz et al., Food and Chemical Toxicology, 2012. Regulation (EU) 2024/3190. OEHHA, Prop 65 BPA relisting notice, 2020.
