How BPA and BPS Disrupt Hormones

Your reproductive system runs on hormones. Estrogen, progesterone, testosterone — these chemical signals time your menstrual cycle, regulate sperm production, trigger ovulation, and maintain pregnancy. They operate in tiny amounts, and your body is sensitive to even small changes.

BPA and BPS are structurally similar to estrogen. When they enter your bloodstream, they can bind to estrogen receptors — essentially mimicking estrogen or blocking it — sending false signals that throw your hormonal balance off.

What makes this unusual compared to most chemicals is that endocrine disruptors don't follow the normal rule of "higher dose = more harm." Even very small amounts, at the wrong moment, can produce outsized effects. This is especially true during critical reproductive windows: while trying to conceive, during early pregnancy, or in adolescence when hormonal systems are still developing.

What the Research Shows: Female Fertility

Egg Cell Quality

A 2024 review in Human Reproduction Update, one of the leading journals in reproductive medicine, examined dozens of studies on bisphenols and female fertility. The conclusion was direct: bisphenol exposure can damage the ovaries and the eggs inside them, potentially reducing a woman's reproductive capacity, lowering pregnancy success rates, and affecting the health of offspring.

The review also found that BPS — the chemical now used in most "BPA-free" receipt paper — causes comparable damage to BPA through the same biological pathways. Switching from BPA to BPS did not make the paper safer from a fertility standpoint.

PCOS and Ovarian Disorders

A February 2026 review found links between bisphenol exposure (including BPS and BPAF) and polycystic ovary syndrome (PCOS), a hormonal condition that affects ovulation and is one of the most common causes of female infertility. The research used both animal and human cell studies to identify plausible biological mechanisms — not just statistical associations.

Indirect Damage: Oxidative Stress and Inflammation

Researchers at the University of Guelph have found that BPA, BPS, and BPF can trigger oxidative stress inside egg cells — essentially damaging them at the cellular level. This type of damage to egg quality is directly linked to reduced fertility and higher rates of early pregnancy loss.

What the Research Shows: Male Fertility

Sperm Count and Motility

A study of 158 men attending a fertility treatment clinic found that higher urinary levels of BPS were associated with lower sperm concentration and lower sperm motility — two of the key measures used to assess male fertility. Men with higher body mass index showed an even stronger effect.

A 2025 study published in the World Journal of Men's Health found that BPA, BPS, and BPF all interfere with spermatogonial stem cells — the cells responsible for continuous sperm production throughout a man's life. Exposure reduced survival rates and disrupted the normal renewal process these cells depend on.

Sperm Structure and DNA Integrity

Lab research published in 2025 in Toxicology and Industrial Health found that all three major bisphenols — BPA, BPS, and a newer analog called TMBPF — reduced spermatid size and increased the rate of chromosomal abnormalities in sperm cells. Abnormal chromosomes in sperm are a leading cause of failed fertilization and early miscarriage.

The Receipt Connection: Why Cashiers Are at Higher Risk

Receipts printed on thermal paper contain bisphenols as a coating, not as a trace contaminant. The concentration is many times higher than what's found in plastic bottles or canned food lining.

When you touch a receipt, the chemical transfers directly to your skin and can be absorbed into your bloodstream. Studies have confirmed this with urine testing: cashiers show BPA levels in urine roughly 2.5 times higher than people in other occupations. One study found that daily occupational exposure through receipt handling can reach up to 1,300 nanograms per day — compared to about 17 nanograms for the general population who handle receipts occasionally.

Two things make absorption worse:

  • Hand sanitizer — increases skin permeability, potentially boosting BPA absorption by up to 100 times
  • Lotions and moisturizers — similar effect; the emollients open up the skin barrier

The European Union has explicitly flagged cashiers as a population at risk of unsafe BPA exposure levels from thermal paper. The Minnesota Pollution Control Agency specifically recommends that pregnant cashiers and women of childbearing age be given the option to switch to non-receipt duties where possible.

"BPA-Free" Doesn't Mean Safe

This is the most important thing to understand: if your store switched to BPA-free receipt paper, that paper almost certainly contains BPS instead. And BPS now has its own growing body of evidence showing it causes the same kinds of fertility-related damage.

The February 2026 review in Archives of Medical Research was clear: BPS and related substitutes interfere with the same hormone systems and gene-regulation pathways as BPA. Bisphenols as a class — not just BPA specifically — appear to be the problem.

What You Can Do

You don't have to leave your job to reduce your exposure. Small changes in habit can meaningfully lower how much bisphenol enters your body each day.

At work:

  • Wear nitrile gloves when handling receipts — this is the single most effective step for cashiers
  • Avoid using hand sanitizer before touching receipts
  • Wash hands with plain soap and water, not sanitizer, after handling receipts
  • If you're pregnant or trying to conceive, talk to your manager about rotating to duties that don't involve receipt handling — most employers will accommodate this

Advocating for change:

  • Ask your employer about switching to phenol-free thermal paper (it exists and is commercially available)
  • Digital receipts — email or SMS — eliminate the exposure entirely for customers and reduce the paper volume cashiers handle

At home:

  • Avoid putting receipts in your purse or pocket alongside food
  • Wash hands before eating, especially after any shopping trip

A Note on What We Don't Yet Know

The science here is still developing. Most of the direct human fertility studies are relatively recent, and large-scale longitudinal studies specifically tracking cashiers' reproductive outcomes don't yet exist. What we have is a combination of human biomonitoring studies, animal research, and cell-level lab work — all pointing in the same direction.

That's not the same as proven cause and effect in humans. But it is enough for regulators in the EU and several US states to have acted, and enough for individuals to take practical precautions without waiting another decade for the final word.

If you have concerns about your specific situation — especially if you're trying to conceive or are currently pregnant — a conversation with your doctor or a reproductive endocrinologist is the right next step. What you handle at work is relevant medical context worth sharing.

The information on this page is for educational purposes and does not constitute medical advice. If you have concerns about chemical exposure and your reproductive health, please speak with a qualified healthcare provider.