BPA-Free Isn’t Enough — Here’s What to Look For Instead

BPA-free has been a standard marketing claim on plastic products for over a decade. The problem is that BPA-free doesn’t mean the product is free of BPA’s chemical relatives, some of which have been found to have similar or stronger hormonal activity than BPA itself.

What BPA Is and Why It Was Removed

BPA (bisphenol A) is a synthetic compound used to harden polycarbonate plastics and line metal food cans. It was identified as an endocrine disruptor — a chemical that interferes with hormone signaling — through research going back to the 1990s. By the early 2010s, the FDA had banned BPA from baby bottles and sippy cups, and the broader consumer market largely moved away from it under public pressure.

BPA works by binding to estrogen receptors in the body. Even at very low concentrations, it has been shown in laboratory and animal studies to affect developmental processes. Human epidemiological studies associate higher urinary BPA levels with markers of cardiovascular disease, type 2 diabetes, and reproductive effects, though causality is difficult to establish in observational research.

The Replacement Problem

When manufacturers removed BPA, they had to replace it with something that performed the same structural function. The most common replacements were:

BPS (bisphenol S): Now found in many products labeled BPA-free. Laboratory studies have shown BPS to be at least as potent as BPA at activating estrogen receptors, and in some cell studies, more potent. A 2018 paper in Endocrine Reviews analyzed studies of BPS and concluded it was “not a safe substitute for BPA.”

BPF (bisphenol F): Another structural analog. Research by the National Institute of Environmental Health Sciences found BPF had similar hormonal activity to BPA in laboratory models.

BPAF, BPB, BPZ: Less common bisphenol variants that have been identified in the food contact material supply chain and in human biomonitoring studies.

DINP and DIDP (phthalates): Used as plasticizers in PVC products. When phthalates like DEHP were restricted, DINP and DIDP replaced them. Both are now under EU restriction based on reproductive toxicity concerns.

The regulatory situation in the US remains behind Europe’s. The EU’s REACH regulation has restricted or banned several BPA analogs in food contact materials. The FDA reviews individual compounds on a petition basis, which is a much slower process.

Plastics to Understand

Plastic products are stamped with a resin identification code (the number inside the recycling triangle). This tells you what the plastic is made of, which is useful:

#1 PET (polyethylene terephthalate): Standard single-use water bottles and food containers. Does not contain bisphenols or phthalates as part of its chemistry, but can leach antimony (used as a catalyst in manufacturing) and acetaldehyde, particularly when heated or stored long-term. Not intended for repeated use.

#2 HDPE (high-density polyethylene): Milk jugs, some reusable water bottles, many food containers. One of the lower-concern plastics. Does not require bisphenols or phthalates in its manufacturing.

#3 PVC (polyvinyl chloride): Requires plasticizers to be flexible. This is where phthalates are most commonly used. Avoid #3 for food contact.

#4 LDPE (low-density polyethylene): Squeeze bottles, flexible packaging. Generally considered lower-concern.

#5 PP (polypropylene): Common in food containers, yogurt tubs, Tupperware. Does not require bisphenols or phthalates. Lower-concern for food contact.

#6 PS (polystyrene): Foam cups, disposable food containers. Can leach styrene, particularly when in contact with hot food or alcohol. Avoid for hot food.

#7 Other: This is the catch-all category and the most variable. Polycarbonate (which requires BPA as a building block) is a #7. So is Tritan (a BPA-free copolyester used in Nalgene and many reusable bottles). The problem is the category tells you almost nothing specific — you need to know the actual material.

Tritan: The Nuance

Tritan is Eastman Chemical’s trademarked BPA-free copolyester, used widely in reusable water bottles and food containers by brands like Nalgene, Rubbermaid, and many others. Eastman has maintained that Tritan is free of estrogenic activity, and independent testing has generally supported this.

However, a 2020 study in the journal Food Additives and Contaminants found that Tritan products did leach compounds with estrogenic activity under certain conditions, particularly UV exposure. Eastman disputed the methodology. The debate hasn’t been fully resolved. Tritan is almost certainly an improvement over polycarbonate, but it’s not the same as glass or stainless steel.

What to Actually Use

Glass: For food storage, glass is the most chemically inert option. Ball, Pyrex, and Anchor Hocking are the main brands. The only practical downsides are weight and breakability.

Stainless steel: For bottles, food containers, and travel mugs. 18/8 or 304 stainless steel is the standard food-safe grade. Klean Kanteen, Hydro Flask, and Yeti use food-grade stainless. Avoid lined stainless containers where you can’t verify the lining material.

Silicone: Food-grade silicone is considered chemically stable and has passed regulatory review in both the US and EU. It’s used in stasher bags, baking mats, baby products, and flexible storage containers. The primary practical concern is that low-quality silicone can contain filler materials; stick with brands that specify platinum-cured, food-grade silicone.

Ceramic: For mugs, bowls, and plates, lead-free and cadmium-free ceramic is inert. The concern with ceramic is the glaze, not the ceramic body — import brands without heavy metal testing documentation carry more risk than domestic or verified international manufacturers.

Reading Labels More Carefully

“BPA-free” tells you BPA is absent. It says nothing about BPS, BPF, or phthalates. More useful signals:

• “Made without BPA, BPS, or BPF” — a stronger claim, though still self-reported
• NSF/ANSI 51 certification — covers food equipment materials and includes chemical migration testing
• MADE SAFE or EWG Verified on baby and food contact products

Recommended Products

Browse BPA-free and plastic-free food storage at Products Free of BPA and Non-Toxic Food Storage Products

Glass and stainless steel containers: Non-Toxic Glass Products and Non-Toxic Stainless Steel Products

Summary

BPA-free labeling indicates only that BPA has been removed, not that its structural analogs — BPS, BPF, and others — are absent. These replacements carry similar or overlapping concerns. The most practical solution for food storage and water bottles is switching to glass, stainless steel, or verified food-grade silicone, which sidestep the bisphenol question entirely. For plastic products that remain in your home, codes #2, #4, and #5 are the lower-concern options; avoid #3 and #6 for food contact, and ask specifically about the material when buying #7.