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Replacement bisphenols, phthalates, and micro-/nanoplastic exposures in human reproductive endocrinology
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This review pulls together existing research on "BPA-free" plastics, phthalates, and micro/nanoplastics, showing they can all disrupt hormone production through similar pathways in the body, like stress on cells and inflammation. The evidence is strongest for phthalates (common in personal care products and packaging), but still developing for newer plastic chemicals and microplastics. Bottom line: swapping BPA for other plastic chemicals doesn't necessarily make products safer for reproductive health.
Restrictions on bisphenol A (BPA), continued exposure to phthalates, and the emergence of micro- and nanoplastics (MNPs) have altered the plastic-associated exposure landscape relevant to human reproduction. Existing reviews commonly address these exposures separately or summarize broad reproductive outcomes. This review instead develops a comparative mechanistic framework centered on two connected mechanisms: disruption of gonadotropin-responsive steroidogenesis and oxidative stress, inflammation, and barrier dysfunction. Human biomonitoring, reproductive-tissue, fertility-clinic, and epidemiological evidence are prioritized, while experimental studies are used to resolve mechanisms that cannot be tested directly in humans. Replacement bisphenols can reproduce BPA-like estrogenic, anti-androgenic, and steroidogenic effects, but their actions are analogue-, tissue-, dose-, and time-dependent. Selected phthalates and metabolites have been shown in experimental and ex vivo studies to impair androgen synthesis through altered gonadotropin signaling, cholesterol transport, mitochondrial function, and steroidogenic enzymes. MNPs are heterogeneous particulate exposures whose biological effects depend on polymer composition, size, shape, surface properties, weathering, corona formation, additives, and co-contaminants. Experimental studies using specific MNP models suggest mainly indirect effects on steroidogenesis through particle uptake, altered gonadotropin-responsive signaling, organelle stress, inflammation, and barrier injury. Despite different initiating mechanisms, evidence across the three exposure classes implicates steroidogenesis, redox regulation, inflammatory signaling, and reproductive tissue barriers, although the strength and directness of evidence differ. Human evidence is strongest for phthalates, emerging and analogue-specific for replacement bisphenols, and still methodologically limited for MNP-related clinical outcomes. The framework separates direct catalytic inhibition from altered expression, tissue detection from toxicity, and mechanistic plausibility from demonstrated human effect, supporting targeted research, cautious clinical communication, safer chemical substitution, and MNP exposure mitigation.
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This review summarizes how chemicals released from plastics, known as endocrine disruptors, can interfere with the body's hormone systems. Common substances like BPA and phthalates mimic or block hormones, contributing to obesity, diabetes, reproductive problems, and developmental issues in children. Micro- and nanoplastics make the problem worse because they can release these hormone-disrupting chemicals inside the body after being ingested or inhaled.
BPS and BPF are as Carcinogenic as BPA and are Not Viable Alternatives for its Replacement.
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This review presents evidence that BPS and BPF — chemicals used as 'BPA-free' replacements in plastics — have similar cancer-promoting and endocrine-disrupting properties to BPA itself. The substitution of one hormone-disrupting plastic chemical with nearly identical alternatives means consumers are not actually avoiding the health risks they are trying to escape.
Bisphenols—A Threat to the Natural Environment
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This review examines the environmental and health threats posed by bisphenol A (BPA) and its replacements, bisphenol F and bisphenol S, which were introduced as safer alternatives. However, because these substitutes have similar chemical structures to BPA, they may pose comparable risks to human health and the environment, including hormone disruption. The study is relevant to microplastics research because bisphenols are common additives in plastics that can leach out as plastics break down into microparticles.
01 | Microplastics Endocrine-disrupting Chemicals and Human Health: Metabolic and Reproductive Risks in a One Health Perspective
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Microplastics have been found in human blood, placenta, and even breast milk—and this review of existing research shows they're not just harmless specks passing through our bodies. As they break down, they release hormone-disrupting chemicals like bisphenols and phthalates that may contribute to insulin resistance, weight gain, and fertility problems, with some evidence these effects could even pass to future generations. While more research is needed to fully understand the risks in humans, scientists say reducing plastic exposure and developing better ways to detect these effects early could help protect both our health and our reproductive future.
Micro- and Nanoplastics as Disruptors of the Endocrine System—A Review of the Threats and Consequences Associated with Plastic Exposure
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This review summarizes how micro- and nanoplastics carry endocrine-disrupting chemicals that interfere with hormones controlling reproduction, thyroid function, metabolism, and brain development. The reproductive system is especially vulnerable, with studies showing that plastic particle exposure can cause oxidative stress, cell death, and infertility, raising serious concerns given how widespread these particles are in food and the environment.
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