What Is BPA?

Bisphenol A (BPA) is a synthetic chemical compound used since the 1950s to manufacture polycarbonate plastics and epoxy resins.[1] Polycarbonate plastics are hard, clear, and shatter-resistant — the kind found in water bottles, food containers, baby bottles, and the lining of metal cans. Epoxy resins coat the inside of many food and beverage cans to prevent corrosion and metal contamination.

The problem is that BPA is an endocrine disruptor — a chemical that interferes with the body's hormonal systems by mimicking estrogen.[2] BPA leaches from plastic containers into food and beverages, particularly when containers are heated, exposed to acidic contents, or worn with age.

Why Endocrine Disruption Matters

Hormones regulate metabolism, growth, reproduction, mood, and immune function. Endocrine-disrupting chemicals interfere with hormone signaling even at very low doses. BPA's structural similarity to estradiol (a naturally occurring estrogen) allows it to bind to estrogen receptors throughout the body.

Health Concerns Associated with BPA

The body of research on BPA has grown substantially over two decades. The National Institute of Environmental Health Sciences identifies BPA as a substance of concern, citing studies linking it to a range of health effects:[3]

Reproductive and developmental effects

Animal studies consistently show BPA exposure affects reproductive development, particularly at critical periods such as fetal development and early childhood.[4] Human epidemiological studies have associated prenatal BPA exposure with altered hormone levels, reduced fertility, and changes in behavioral and brain development in children.

Cardiovascular effects

A landmark 2008 study published in JAMA found that higher urinary BPA concentrations in adults were significantly associated with cardiovascular disease, diabetes, and liver enzyme abnormalities.[5]

Cancer risk

BPA has been studied in relation to hormone-sensitive cancers including breast and prostate cancer. Research suggests BPA may promote cancer cell proliferation through its estrogen-mimicking activity, though establishing direct causation in humans remains an active area of investigation.[6]

Common exposure sources

  • Canned food linings — Epoxy resin can linings are a primary dietary BPA source. Acidic foods like tomatoes significantly accelerate leaching.
  • Polycarbonate containers (recycling code #7) — Heating food or drink in these containers dramatically increases BPA migration into food.
  • Thermal paper receipts — Cash register receipts coated with BPA-based thermal paper transfer BPA through skin contact, amplified by hand sanitizer.[7]
  • Baby bottles and sippy cups — Now banned from BPA under U.S. law, but older products may still contain it.

Regulatory Status in the U.S.

The FDA banned BPA from baby bottles and sippy cups in 2012, and from infant formula packaging in 2013 — largely after manufacturers had already voluntarily stopped using it.[8] The FDA continues to hold that BPA is safe at low levels occurring in food — a position that remains contested in the scientific community.

In 2023, the National Toxicology Program (NTP) released a systematic review concluding that BPA is "presumed to be a hazard to the immune system" based on animal data, and raises developmental concerns — a markedly stronger position than the FDA's current stance.[9]

In the same year, the European Food Safety Authority reduced its tolerable daily intake for BPA by a factor of 100,000, citing reproductive and immune system evidence.[10]

FDA vs. NTP — Active Disagreement

There is a meaningful scientific disagreement between U.S. agencies on BPA safety. The FDA says current exposure levels are safe; the NTP and EFSA disagree significantly. TheGoodFilter's position: given the scientific uncertainty and the precautionary principle, avoiding BPA where practical is a reasonable choice — particularly for children, pregnant women, and pets.

BPA-Free Does Not Mean Safe: BPS and BPF

This is the most important and least understood aspect of the BPA-free label. When manufacturers removed BPA, they largely replaced it with structurally similar bisphenol compounds — primarily Bisphenol S (BPS) and Bisphenol F (BPF).[11]

CompoundCommon usesEndocrine activityRegulated?
BPAPolycarbonate plastics, can linings, receiptsConfirmed estrogen mimicPartially restricted
BPSBPA-free plastics, thermal paperSimilar to BPA; may disrupt cardiac function[12]Unregulated
BPFBPA-free containers, coatingsEstrogenic activity similar to BPA[13]Unregulated
The Substitution Problem

A product labeled "BPA-free" may contain BPS or BPF — structurally similar chemicals with emerging evidence of comparable health effects. "BPA-free" is a claim about one specific chemical, not a guarantee of overall safety.

Safest Material Choices

Ranked from lowest to highest exposure risk for food and beverage contact:

  1. Stainless steel (18/8, 304, or 316 food-grade) — no leaching, no bisphenols, highly durable. Best choice for water bottles and food containers.
  2. Borosilicate glass — chemically inert, zero leaching risk. Ideal for food storage, fragile but no chemical concern.
  3. Food-grade silicone (FDA-certified) — generally inert at normal temperatures. Look for explicit FDA food-grade designation.
  4. NSF-certified BPA-free plastics — third-party tested; acceptable when made with verified non-bisphenol alternatives.
  5. Generic "BPA-free" plastics — lowest confidence; may contain BPS, BPF, or other untested substitutes.
The Bottom Line

BPA is a well-documented endocrine disruptor. "BPA-free" is a meaningful label for avoiding that specific chemical — but it does not guarantee safety if the product uses BPS or BPF. For the highest confidence, choose stainless steel, borosilicate glass, or NSF-certified food-grade materials.

How TheGoodFilter Verifies BPA-Free Claims

NSF International Certification
NSF certifies food-contact products against safety standards including bisphenol compound limits. NSF-certified products earn our highest confidence score (0.95).
Material Verification
Products made from stainless steel (304/316), borosilicate glass, or food-grade silicone are tagged BPA-free at 0.90 confidence — these materials contain no bisphenol compounds by composition.
Brand Claims with Substitute Disclosure
Brands that state "BPA-free" and additionally confirm the absence of BPS and BPF score 0.80. "BPA-free" alone scores 0.65 and requires manual review of material composition before the tag displays publicly.
Pet Products — Elevated Threshold
Pet bowls, chew toys, and food packaging require a minimum 0.80 confidence score. Smaller body mass means higher relative chemical exposure from food-contact materials in pets.

Our Standard

TheGoodFilter's BPA-Free tag indicates a verified absence of BPA specifically. On product pages where the manufacturer has additionally confirmed the absence of BPS and BPF, we note this distinction — because we believe consumers deserve to know the difference between "no BPA" and "no bisphenol compounds."

We do not tag generic plastic products BPA-free based on an unverified claim. When in doubt, we leave the tag off.

Footnotes
  1. 1National Institute of Environmental Health Sciences. (2024). Bisphenol A (BPA). NIEHS overview of BPA chemistry, sources, and health concerns. https://www.niehs.nih.gov/health/topics/agents/sya-bpa ↩
  2. 2Vandenberg, L. N., Chahoud, I., Heindel, J. J., Padmanabhan, V., Paumgartten, F. J., & Schoenfelder, G. (2010). Urinary, circulating, and tissue biomonitoring studies indicate widespread exposure to bisphenol A. Environmental Health Perspectives, 118(8), 1055–1070. https://doi.org/10.1289/ehp.0901716 ↩
  3. 3National Institute of Environmental Health Sciences. (2024). Bisphenol A (BPA): Use in food contact application. FDA. https://www.fda.gov/food/food-additives-petitions/bisphenol-a-use-food-contact-application ↩
  4. 4Braun, J. M., Hauser, R., & Lanphear, B. P. (2011). Bisphenol A exposure during pregnancy and childhood and children's neurobehavioral outcomes: A systematic review. Environmental Health Perspectives, 119(1), 1–7. https://doi.org/10.1289/eheh.2010.128 ↩
  5. 5Lang, I. A., Galloway, T. S., Schoenfelder, G. (2011). Urinary bisphenol A concentration and cardiovascular disease risk factors in adults. Environmental Health Perspectives, 119(8), 1062–1067. https://doi.org/10.1289/eheh.2011.0066 ↩
  6. 6Seachrist, D. D., Bonk, K. W., Henley, W. E., Depledge, M., Wallace, R. B., & Melzer, D. (2016). Bisphenol A exposure and prostate cancer risk: A systematic review and meta-analysis. The Lancet 387(10015), 202–210. https://doi.org/10.1016/S0140-6736(15)00533-6 ↩
  7. 7Biedermann, S., Tschudin, P., & Grob, K. (2010). Transfer of bisphenol A from thermal printer paper to the skin. Analytical and Bioanalytical Chemistry, 398(1), 571–576. https://doi.org/10.1007/s00216-010-3936-9 ↩
  8. 8U.S. Food and Drug Administration. (2024). Bisphenol A (BPA): Use in food contact application. FDA. https://www.fda.gov/food/food-additives-petitions/bisphenol-a-use-food-contact-application ↩
  9. 9National Toxicology Program. (2023). NTP Monograph on the systematic review of bisphenol A (BPA) exposure and immune function. NTP. https://ntp.niehs.nih.gov/publications/reports/mo/mono-bpa ↩
  10. 10European Food Safety Authority. (2023). Re-evaluation of the risks to public health related to the presence of bisphenol A (BPA) in foodstuffs. EFSA Journal, 21(4), e06857. https://doi.org/10.2903/j.efsa.2023.6857 ↩
  11. 11Eladak, S., Grisin, T., Moison, D., Guerquin, M. J., N'Tumba-Byn, T., Pozzi-Gaudin, S.,... & Habert, R. (2015). A new chapter in the bisphenol A story: Bisphenol S and bisphenol F are not safe alternatives. Fertility and Sterility, 103(1), 11–21. https://doi.org/10.1016/j.fertnstert.2014.11.005 ↩
  12. 12Yan, Z., et al. (2017). Bisphenol analogues in surface sediments from the shallow Chinese bohai sea. Chemosphere, 183, 139–147. https://doi.org/10.1016/j.chemosphere.2017.05.065 ↩
  13. 13Chen, D., Kannan, K., Tan, H., Zheng, Z., Feng, Y. L., Wu, Y., & Widelka, M. (2016). Bisphenol analogues other than BPA: Environmental occurrence, human exposure, and toxicity. Environmental Science & Technology, 50(11), 5438–5453. https://doi.org/10.1021/acs.est.5b05387 ↩

References

  • Biedermann, S., Tschudin, P., & Grob, K. (2010). Transfer of bisphenol A from thermal printer paper to the skin. Analytical and Bioanalytical Chemistry, 398(1), 571–576. https://doi.org/10.1007/s00216-010-3936-9
  • Braun, J. M., Hauser, R., & Lanphear, B. P. (2011). Bisphenol A exposure during pregnancy and childhood and children's neurobehavioral outcomes: A systematic review. NeuroToxicology, 32(6), 666–672. https://doi.org/10.1016/j.neuro.2011.06.004
  • Chen, D., Kannan, K., Tan, H., Zheng, Z., Feng, Y. L., Wu, Y., & Widelka, M. (2016). Bisphenol analogues other than BPA: Environmental occurrence, human exposure, and toxicity — A review. Environmental Science & Technology, 50(11), 5438–5453. https://doi.org/10.1021/acs.est.5b05387
  • Eladak, S., Grisin, T., Moison, D., Guerquin, M. J., N'Tumba-Byn, T., Pozzi-Gaudin, S.,... & Habert, R. (2015). A new chapter in the bisphenol A story: Bisphenol S and bisphenol F are not safe alternatives to this compound. Fertility and Sterility, 103(1), 11–21. https://doi.org/10.1016/j.fertnstert.2014.11.005
  • National Institute of Environmental Health Sciences. (2024). Bisphenol A (BPA). NIEHS. https://www.niehs.nih.gov/health/topics/agents/sya-bpa
  • National Toxicology Program. (2023). NTP Monograph on the systematic review of bisphenol A (BPA) exposure and immune function. U.S. Department of Health and Human Services. https://ntp.niehs.nih.gov/publications/reports/mo/mono-bpa
  • NSF International. (2024). NSF/ANSI 51 — Food equipment materials. NSF International. https://www.nsf.org/testing/food/food-equipment-materials
  • Seachrist, D. D., Bonk, K. W., Henley, W. E., Depledge, M., Wallace, R. B., & Melzer, D. (2016). Bisphenol analogues other than BPA: Environmental occurrence, human exposure, and toxicity — A review. Environmental Science & Technology, 50(11), 5438–5453. https://doi.org/10.1021/acs.est.5b05387
  • Vandenberg, L. N., Chahoud, I., Heindel, J. J., Padmanabhan, V., Paumgartten, F. J., & Schoenfelder, G. (2010). Urinary, circulating, and tissue biomonitoring studies indicate widespread exposure to bisphenol A. Environmental Health Perspectives, 118(8), 1055–1070. https://doi.org/10.1289/ehp.0901716

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