Understanding the reproductive exposome, environmental chemicals, drinking water, seafood, household products, and occupational hazards—and how evidence-informed preconception care can help reduce preventable risks.
When preparing for pregnancy, most prospective parents begin by thinking about their health.
They may improve their nutrition, establish an exercise routine, review medications, or schedule a preconception consultation.
But what about the environment in which they live?
Could the water they drink, the seafood they consume, the products they use, or the substances they encounter at work influence reproductive health?
And if certain environmental chemicals can affect biological development, how can prospective parents distinguish meaningful risks from the overwhelming amount of environmental health information circulating online?
These questions introduce an important dimension of preconception care: environmental and occupational health.
A foundational article published in the American Journal of Obstetrics & Gynecology in 2008, The Clinical Content of Preconception Care: Environmental Exposures, argued that preparing for pregnancy should include a careful environmental history.
Its authors, McDiarmid, Gardiner, and Jack, identified several exposures deserving particular attention: mercury from fish, lead, contaminated drinking water, occupational chemicals, and hazards encountered through household activities.
Their recommendations were built around a straightforward principle.
Environmental risks cannot be understood without knowing where someone lives, works, eats, and spends their time.
Nearly two decades later, research has considerably expanded this perspective.
Investigators are now studying thousands of industrial and consumer chemicals, including substances used in plastics, food packaging, personal care products, household materials, and agricultural systems.
We also understand more about how environmental exposures may interact with endocrine regulation, placental biology, fetal growth, and reproductive development.
However, an important distinction must be established from the beginning.
The presence of a chemical in the environment—or even its detection in the body—does not automatically establish that it will cause disease or adversely affect a pregnancy.
Risk depends on the substance, its biological properties, dose, exposure route, timing, and the individual's circumstances.
The purpose of preconception environmental health is not to eliminate every detectable chemical.
It is to identify meaningful exposures, understand the quality of the evidence, and make reasonable changes that reduce avoidable risks.
1. What Is the Reproductive Exposome?
The exposome is a scientific framework describing the totality of environmental exposures experienced throughout life and their biological consequences.
Unlike the genome, which represents inherited DNA sequence information, the exposome encompasses external and internal influences that change over time.
External exposures can include air pollution, drinking water contaminants, occupational chemicals, dietary substances, and consumer products.
Internal biological responses can involve metabolic pathways, endocrine signaling, inflammatory mediators, and other physiological processes affected by these exposures.
The reproductive exposome applies this broader concept to fertility, conception, pregnancy, and developmental health.
It recognizes that reproductive outcomes result from interactions among genetic factors, physiological characteristics, environmental exposures, and other circumstances.
Importantly, exposures can occur before pregnancy.
For example, certain persistent chemicals remain in the body for years.
Other substances are eliminated more rapidly but may be encountered repeatedly through everyday activities.
The biological relevance of an exposure may therefore depend on both its persistence and when it occurs relative to reproductive development.
This makes preconception care an important opportunity for prevention.
2. Why Timing Matters: Fertility, Implantation, and Early Development
Reproductive biology unfolds through several stages.
Before conception, ovarian follicles undergo development, sperm cells are produced and mature, and hormonal systems coordinate reproductive function.
Following fertilization, embryonic cell division and implantation occur.
Subsequent weeks involve rapid tissue differentiation and the early development of major organ systems.
Certain exposures may interfere with biological processes occurring during particular developmental windows.
For example, lead and methylmercury are established developmental toxicants.
Other chemicals are being investigated for possible effects on endocrine signaling, ovarian function, sperm development, or placental physiology.
However, evidence of a biological mechanism does not necessarily demonstrate that an exposure causes clinically significant infertility or developmental harm at typical population concentrations.
Laboratory studies, animal experiments, epidemiological research, and clinical trials provide different types of evidence.
A responsible interpretation requires considering these sources together.
3. Mercury: Why Seafood Selection Matters Before Pregnancy
One of the most established environmental concerns in preconception nutrition involves methylmercury.
Mercury occurs naturally but can also enter the environment through human activities.
In aquatic ecosystems, microorganisms can transform certain forms of mercury into methylmercury.
This compound accumulates in aquatic food chains.
Larger, longer-lived predatory fish may contain particularly high concentrations.
Methylmercury is a recognized neurotoxicant.
The developing nervous system is especially vulnerable to sufficiently high exposures.
Consequently, fish selection deserves attention before and during pregnancy.
However, avoiding all seafood would be an overly simplistic response.
Fish also provide important nutrients, including protein, omega-3 fatty acids, iodine, vitamin B12, iron, and choline.
Some of these nutrients are relevant to maternal health and fetal development.
The objective is therefore to balance nutritional benefits with contaminant exposure.
4. Modern Seafood Guidance: Choose Wisely Rather Than Avoid Fish
The original 2008 AJOG paper recommended limiting certain fish species because of mercury concentrations.
Current FDA and EPA guidance provides a more detailed framework.
Individuals who are pregnant, breastfeeding, or may become pregnant are encouraged to consume approximately 8–12 ounces of lower-mercury seafood per week, typically divided into two or three servings.
A standard adult serving is approximately four ounces.
Examples of lower-mercury choices include salmon, sardines, shrimp, cod, tilapia, trout, and canned light tuna.
Fish in the highest-mercury category should be avoided during pregnancy and when planning pregnancy.
These include swordfish, shark, king mackerel, marlin, orange roughy, bigeye tuna, and tilefish from the Gulf of Mexico.
The distinction between different tuna varieties is important.
Canned light tuna, generally made from smaller species such as skipjack, is categorized differently from albacore or bigeye tuna because mercury concentrations vary.
Locally caught fish may require additional precautions.
State and local advisories provide information about contamination in specific waterways.
These recommendations illustrate an important principle of precision nutrition.
The question is not simply whether seafood is healthy or unhealthy.
It is which seafood, in what quantity, and under what exposure circumstances.
5. Lead: A Well-Established Developmental Toxicant
Lead remains one of the most important environmental substances to consider during preconception care.
Lead can affect neurological, hematological, renal, and other physiological systems.
Its developmental toxicity is well established.
Potential exposure sources include deteriorating lead-based paint, contaminated soil, certain occupational activities, and some imported products.
Lead can also be present in particular ceramics, traditional remedies, cosmetics, and other products.
An especially important characteristic of lead is its ability to accumulate in bone.
Bone serves as a long-term reservoir.
During pregnancy and lactation, changes in bone metabolism can mobilize some previously stored lead into the circulation.
Consequently, an exposure occurring years before pregnancy may remain relevant under certain circumstances.
The original AJOG paper emphasized this point.
It recommended a detailed exposure history and consideration of blood lead testing when there is a plausible history of significant exposure.
However, indiscriminate testing of every prospective parent is not necessarily appropriate.
Testing should be guided by exposure history and applicable clinical recommendations.
6. What Should Someone Do About Possible Lead Exposure?
The most effective intervention is identifying and reducing the source of exposure.
For example, a person living in an older home with deteriorating paint may benefit from professional lead-safe assessment.
Someone whose occupation involves lead may require workplace exposure evaluation.
A person using imported ceramics or other products that may contain lead should investigate whether those items are safe for food use.
When meaningful exposure is suspected, a qualified healthcare professional can determine whether blood lead testing is appropriate.
If elevated blood lead concentrations are identified, management depends on the level, exposure circumstances, symptoms, and reproductive status.
Specialized occupational or environmental medicine consultation may be helpful.
Lead chelation is not a routine wellness intervention.
It is a medical treatment reserved for specific circumstances and requires appropriate clinical supervision.
Similarly, nutritional adequacy can support general health, but supplements should not be presented as treatments that reliably remove stored lead.
The priority is identifying and stopping significant exposure.
7. Drinking Water: Why the Source Matters
Drinking water is another important component of environmental health.
Potential contaminants vary according to geographic location, water source, infrastructure, and surrounding land use.
Examples include nitrate, lead, arsenic, microbial contaminants, and certain industrial chemicals.
The original AJOG paper specifically emphasized private well water.
This remains an important distinction.
Public water systems are subject to regulatory monitoring requirements.
Private wells generally place greater responsibility for testing and maintenance on property owners.
Current EPA guidance recommends testing private wells at least annually for total coliform bacteria, nitrate, total dissolved solids, and pH.
Additional testing may be appropriate depending on local geology, nearby agriculture, industrial activities, or known contamination.
Pregnancy planning provides a useful opportunity to review the household's water source.
Testing the water itself can often be more informative than beginning with an extensive human biomarker panel.
Explore what’s in your water here.
8. Nitrate Exposure and Private Wells
Nitrate can enter groundwater through agricultural fertilizers, animal waste, septic systems, and other sources.
Elevated nitrate concentrations in drinking water are especially concerning for infants because nitrate can contribute to methemoglobinemia, a condition that impairs normal oxygen transport.
High exposures may also raise concerns during pregnancy.
However, the relationship between maternal nitrate exposure and specific pregnancy complications is more uncertain than the established risk of infant methemoglobinemia from contaminated water.
This distinction matters.
The appropriate intervention is to identify contamination through suitable water testing and address it using an effective water treatment system or alternative safe water supply.
Boiling water does not remove nitrate.
In fact, evaporation can increase nitrate concentration in the remaining water.
Treatment methods must be selected according to the contaminant being addressed.
A filter appropriate for one chemical may not remove another.
9. PFAS: What Are the So-Called Forever Chemicals?
Per- and polyfluoroalkyl substances, commonly called PFAS, are a large family of synthetic chemicals used in numerous industrial and consumer applications.
Some PFAS have been used in firefighting foams, water-resistant materials, certain food-contact applications, and other products.
Several compounds are highly persistent in the environment.
Some also remain in the human body for extended periods.
Common routes of exposure include contaminated drinking water and food.
Researchers have investigated associations between PFAS exposure and several health outcomes, including changes in cholesterol, immune responses, birth weight, and certain pregnancy complications.
However, PFAS are not one uniform substance.
Different compounds vary in persistence, toxicological properties, exposure patterns, and the quality of available evidence.
This makes broad statements about all PFAS scientifically inappropriate.
10. PFAS and Birth Outcomes: What Does JAMA Research Show?
A 2023 study published in JAMA Network Open, Association of Early Pregnancy Perfluoroalkyl and Polyfluoroalkyl Substance Exposure With Birth Outcomes, evaluated 1,400 mother–infant pairs.
Researchers measured several PFAS compounds in early pregnancy and examined birth weight and gestational age.
They also investigated whether maternal folate status influenced the observed associations.
Higher concentrations of selected PFAS were associated with lower birth weight and shorter gestation among women in the lowest quartile of folate status.
These associations were not consistently observed among women with higher folate status.
The results raise the possibility that nutritional circumstances may influence susceptibility to certain environmental exposures.
However, the study was observational.
It cannot establish that folate supplementation prevents PFAS-related pregnancy complications.
Nor should it be used to recommend high-dose folate supplementation as a strategy for treating chemical exposure.
Appropriate folic acid intake before pregnancy remains important because of its established role in reducing neural tube defect risk.
The proposed interaction with PFAS requires additional investigation.
11. What Should Patients Know About PFAS Blood Testing?
One major development since the original AJOG paper is the availability of specialized laboratory tests measuring certain PFAS compounds.
However, the ability to measure exposure is not the same as the ability to interpret its clinical significance.
Current CDC/ATSDR guidance emphasizes that PFAS blood tests have important limitations.
A test may identify concentrations of selected compounds.
It generally cannot determine exactly where exposure occurred.
It cannot establish that an existing illness was caused by PFAS.
Nor can it reliably predict whether an individual will develop a future disease.
No approved medical treatment currently exists that reliably removes PFAS from the body.
Consequently, routine PFAS testing should not be presented as a necessary part of every preconception evaluation.
When someone has a credible history of substantial exposure, such as contaminated household drinking water, testing may sometimes be considered after discussion of its benefits and limitations.
The most practical intervention is often identifying and reducing the exposure source.
12. Phthalates and Plasticizers: Emerging Evidence in Reproductive Health
Phthalates are chemicals used in certain plastics and consumer products.
Some function as plasticizers, making materials more flexible.
Others have been used in fragrances and personal care formulations.
Exposure can occur through food, household products, dust, and other routes.
Many phthalates are metabolized and eliminated relatively quickly.
However, repeated exposure can result in ongoing detection of their metabolites in urine.
Researchers are investigating whether certain phthalates affect reproductive and developmental outcomes through endocrine, inflammatory, or other pathways.
A 2020 study published in JAMA Network Open examined preconception exposure among couples undergoing fertility treatment.
The investigators evaluated 420 singleton births and measured urinary biomarkers of phthalates and substitute plasticizers before conception.
Higher maternal concentrations of selected plasticizer metabolites were associated with increased risk of preterm birth.
Paternal preconception biomarkers were not significantly associated with preterm birth in that study.
These findings suggest that exposures before conception may deserve attention.
However, the study was observational and involved a specific fertility-treatment population.
It does not establish that all plasticizers cause infertility or that avoiding them will prevent premature delivery.
13. Newer Research: Phthalates and Preterm Birth
A 2022 study published in JAMA Pediatrics combined data from 16 U.S. pregnancy cohorts involving 6,045 participants.
Researchers measured urinary metabolites of several phthalates.
Higher concentrations of selected metabolites were associated with increased odds of preterm birth.
The investigators also modeled hypothetical reductions in exposure and estimated how those reductions might influence preterm birth rates.
However, modeled benefits are not equivalent to benefits demonstrated in a randomized exposure-reduction trial.
More recently, a 2026 JAMA Network Open study analyzed environmental chemical biomarkers in 5,318 mother–child pairs.
The researchers evaluated 113 chemical analytes across 10 classes.
Several phthalates and alternative plasticizers were associated with slightly shorter gestation or lower birth-weight measures.
For example, an interquartile-range increase in summed diisononyl phthalate metabolites was associated with approximately 0.6 fewer days of gestation.
Although this average difference is small at the individual level, modest associations involving widespread exposures may be relevant at the population level.
Nevertheless, the findings do not establish direct causation.
They also do not provide an individualized prediction of pregnancy outcome from a urine test result.
14. Phthalates and the Developing Infant Metabolome
A 2025 study published in Nature Communications, Impact of Prenatal Phthalate Exposure on Newborn Metabolome and Infant Neurodevelopment, investigated relationships among maternal phthalate biomarkers, newborn metabolic profiles, and early neurobehavioral measurements.
Researchers analyzed participants from the Atlanta African American Maternal-Child Cohort.
The study identified associations involving metabolites relevant to amino acid and endocrine pathways, including tyrosine and tryptophan metabolism.
The investigators also explored relationships with selected neonatal neurobehavioral scores.
These findings provide possible mechanistic clues.
However, the study was relatively small, and some analyses were exploratory.
Changes in metabolite concentrations do not automatically indicate neurological damage.
Nor can they establish that an individual infant will experience developmental difficulties.
The broader significance is that environmental health research is increasingly examining the biological pathways that may connect exposure with developmental outcomes.
Additional research is needed before these measurements can guide routine clinical decisions.
15. BPA and Other Bisphenols: What Does Endocrine Disruption Mean?
Bisphenol A, commonly called BPA, has been used in certain plastics and epoxy resins.
It is one example of a chemical capable of interacting with endocrine signaling pathways under experimental conditions.
This property is often described as endocrine-disrupting activity.
However, laboratory evidence of receptor activity does not automatically establish clinically meaningful reproductive harm at every human exposure level.
The significance depends on dose, timing, biological context, and other factors.
Some products have replaced BPA with related compounds such as bisphenol S or bisphenol F.
These substitutes may also possess biological activity.
Consequently, a label indicating that a product is BPA-free does not necessarily establish that it is free of all potentially relevant bisphenols.
For individuals interested in practical exposure reduction, reasonable strategies may include avoiding unnecessary heating of food in plastic containers and selecting glass or stainless-steel food-storage options when convenient.
However, these changes should be viewed as precautionary measures rather than proven methods for preventing infertility or pregnancy complications.
16. Environmental Exposure Mixtures: Why One Chemical at a Time May Be Incomplete
Real-world exposures rarely occur in isolation.
Individuals may encounter multiple substances through food, air, water, occupation, and household products.
These exposures may differ in concentration and duration.
Some may interact with shared biological pathways.
Others may have unrelated mechanisms.
The 2026 JAMA Network Open ECHO cohort study is important partly because it examined multiple chemical classes within the same population.
This approach offers a more realistic representation of everyday environmental exposure.
However, studying mixtures introduces substantial methodological challenges.
Researchers must consider correlated exposures, measurement variability, multiple statistical comparisons, and possible confounding.
The detection of several chemicals does not mean their effects simply add together.
Nor does it justify assuming that every measured exposure produces cumulative toxicity.
Mixture research is an important developing field, but many clinical applications remain uncertain.
17. Air Pollution: An Environmental Exposure Beyond Consumer Products
Air quality is another important dimension of reproductive environmental health.
Fine particulate matter, commonly called PM2.5, consists of small airborne particles originating from sources such as combustion, traffic, industry, and wildfire smoke.
These particles can enter the respiratory system and contribute to systemic biological responses.
Epidemiological research has associated certain air pollution exposures with adverse pregnancy outcomes, including reduced fetal growth and preterm birth.
However, effect estimates vary across populations, pollution sources, and study methods.
A 2018 randomized trial in Mongolia evaluated portable HEPA air cleaners during pregnancy.
The intervention reduced measured indoor fine particulate pollution.
However, the study did not find a statistically significant improvement in its primary overall birth-weight outcome.
A prespecified analysis among term births suggested higher average birth weight in the intervention group.
This distinction illustrates why exposure reduction and improved clinical outcomes should not automatically be treated as equivalent.
Reducing harmful air pollution is a reasonable public health objective.
But specific interventions should be evaluated according to what their clinical trials actually demonstrate.
18. Occupational Exposures: Why Workplace History Matters
The original AJOG article placed particular emphasis on occupational hazards.
This remains one of its strongest contributions.
Individuals may encounter substances at work that are uncommon in other environments.
Potential examples include industrial solvents, pesticides, heavy metals, anesthetic gases, and hazardous medications.
Healthcare workers may encounter certain antineoplastic or other hazardous drugs.
Agricultural workers may encounter pesticide formulations.
Manufacturing employees may work with solvents or metals.
Laboratory personnel may handle chemicals requiring specialized protective procedures.
However, occupational risk should not be inferred from a job title alone.
The relevant questions concern specific substances, tasks, exposure concentrations, duration, protective equipment, and workplace controls.
When meaningful exposure is suspected, occupational medicine consultation may be appropriate.
The objective is to identify effective exposure controls, appropriate protective measures, or alternative duties when medically indicated.
These decisions should be individualized and made in accordance with applicable workplace protections.
19. Environmental Exposures Can Enter the Home From Work
Workplace exposures do not always remain at work.
Certain substances may be carried into the home on clothing, shoes, tools, or other materials.
This is sometimes called take-home exposure.
Examples may involve lead dust, pesticides, or other occupational contaminants.
The original AJOG article highlighted this concern and recommended assessing the work environments of household members.
This is especially relevant when one prospective parent works in an occupation involving potential contaminants.
Practical measures may include appropriate workplace hygiene, changing contaminated clothing, following employer safety procedures, and preventing hazardous materials from entering living spaces.
However, ordinary household laundering should not be assumed sufficient for every hazardous substance.
Appropriate procedures depend on the exposure.
20. Household Hobbies and Renovation Projects
Some environmental exposures arise through hobbies and home maintenance.
Potential examples include stained-glass work, soldering, pottery glazing, paint removal, furniture refinishing, and activities involving certain solvents.
Renovation of older buildings may disturb lead-containing materials.
Products used for pest control, paint stripping, or other maintenance activities may also involve substances requiring precautions.
Preconception planning creates an opportunity to review these activities.
For example, someone renovating an older home may benefit from professional lead-safe practices.
A person who regularly works with solvents may want to examine product safety information and ventilation requirements.
The objective is not to stop every hobby.
It is to understand whether a meaningful exposure exists and identify appropriate controls.
21. Pesticides: Established Hazards and Unanswered Questions
Pesticides encompass numerous chemical classes with different toxicological properties.
They may be used in agriculture, landscaping, household pest control, and other settings.
Some pesticide exposures are associated with acute toxicity.
Researchers have also investigated reproductive and developmental outcomes associated with occupational and environmental exposure.
However, the evidence differs substantially by chemical, dose, and exposure route.
It would be inaccurate to treat all pesticide residues or household pest-control products as equally hazardous.
Preconception recommendations should therefore emphasize avoiding unnecessary direct exposure, following product safety instructions, and obtaining occupational guidance when appropriate.
People working with agricultural chemicals may require additional assessment.
For ordinary household pest management, integrated pest management strategies can help reduce unnecessary chemical applications.
These approaches emphasize prevention, sanitation, exclusion, and targeted treatment rather than indiscriminate pesticide use.
22. Environmental Inequality: Why Exposure Risk Is Not Distributed Equally
Environmental exposures are influenced by social and geographic circumstances.
Individuals living near industrial facilities, major roadways, contaminated water sources, or certain agricultural operations may encounter different exposures from those living elsewhere.
Occupational conditions can also vary according to employment opportunities, workplace protections, and financial resources.
This means environmental exposure is not exclusively a matter of consumer choice.
Someone may be unable to move away from a contaminated area.
Another individual may depend on employment involving hazardous substances.
A family may lack the financial resources to install a specialized filtration system.
Consequently, environmental health recommendations must consider feasibility and access.
The responsibility for reducing harmful exposure cannot rest entirely on individual prospective parents.
Public health regulation, infrastructure investment, workplace protections, and environmental monitoring remain essential.
23. What About Environmental Toxin Panels and Detoxification Programs?
The increasing availability of commercial laboratory testing has created opportunities to measure certain environmental chemicals.
However, more testing does not always produce better healthcare.
For some substances, such as lead, validated testing can guide clinical decisions when appropriate exposure risks exist.
For other chemicals, including certain PFAS and short-lived consumer-product metabolites, tests may provide exposure information without clear clinical thresholds or effective treatments.
A positive biomarker does not necessarily indicate toxicity.
It may simply demonstrate that exposure occurred.
Similarly, measuring a chemical does not establish that it caused a symptom or reproductive problem.
The concept of detoxification is also frequently misused in commercial wellness settings.
The body possesses physiological pathways for transforming and eliminating substances through the liver, kidneys, gastrointestinal tract, and other systems.
However, claims that supplements, sauna protocols, intravenous products, or generalized detoxification programs can remove specific environmental contaminants require direct clinical evidence.
For most exposure concerns, the highest-value intervention is identifying and reducing the source.
Medical treatment should be reserved for situations in which it is supported by validated indications.
24. A Practical Preconception Environmental Health Assessment
An evidence-informed assessment can begin with a relatively small number of questions.
Food and water
What seafood is consumed regularly?
Does the household use public water or a private well?
Has the water been tested when appropriate?
Are there local fish consumption advisories?
Home environment
Does the home contain older paint or undergo frequent renovation?
Are potentially hazardous chemicals used during hobbies or maintenance?
Are there known concerns involving contamination or indoor air quality?
Workplace
What substances are handled during work?
Are there recognized reproductive or developmental hazards?
What exposure controls and protective procedures are used?
Could contaminants be brought home on work clothing or equipment?
Medical and reproductive context
Is there a history of documented lead exposure or another significant environmental exposure?
Are both prospective parents aware of relevant occupational risks?
Would a clinician specializing in occupational or environmental medicine be useful?
The goal is to identify situations where specific action may improve safety.
It is not to create an exhaustive inventory of every substance someone encounters.
25. Practical Steps Before Conception
For most prospective parents, a reasonable environmental health strategy emphasizes a limited number of meaningful actions.
Choose lower-mercury seafood. Follow current FDA/EPA guidance while maintaining adequate nutritional intake.
Review drinking water. If using a private well, follow recommended testing schedules and investigate locally relevant contaminants.
Identify potential lead sources. Consider older paint, occupational exposures, contaminated products, and previous documented lead exposure.
Review occupational hazards. Ask about reproductive safety when working with chemicals, hazardous medications, pesticides, or metals.
Reduce avoidable exposures. Use appropriate ventilation, workplace protections, and safe product-handling practices.
Consider simple household substitutions. When practical, reduce unnecessary heating of plastics and choose suitable food-storage materials.
Include both prospective parents. Household and occupational exposures may involve either partner.
Avoid unnecessary testing. Prioritize clinical evaluation and exposure investigation when a meaningful risk is identified.
These steps provide a more useful foundation than attempting to eliminate every detectable environmental chemical.
26. How This Research Informs Our Preconception Care
We recognize that reproductive health is influenced by both internal physiology and the environments in which individuals live.
Preconception care therefore benefits from considering more than laboratory biomarkers or reproductive hormones.
Relevant environmental circumstances may include dietary mercury exposure, drinking water quality, occupational hazards, and documented exposure to substances such as lead.
Within our women's health and conscious conception approach, we emphasize helping prospective parents understand which exposures deserve attention and which findings remain scientifically uncertain.
We also recognize the importance of evaluating both maternal and paternal circumstances.
Our objective is not to promote extensive toxin panels or generalized detoxification programs.
Instead, we prioritize research-informed education, meaningful exposure histories, appropriate referrals, and practical steps that can reduce avoidable risks.
When environmental exposure requires specialized evaluation, collaboration with occupational medicine, medical toxicology, obstetric, or public health professionals is appropriate.
The ultimate goal is to help prospective parents make informed decisions without creating unnecessary anxiety over everyday exposures.
Conclusion: Environmental Health Begins With Better Questions
The environment has always influenced human biology. Modern research has expanded our understanding of how environmental chemicals, pollutants, dietary contaminants, and occupational substances may interact with reproductive and developmental processes.
However, the relationship between exposure and health is not uniform.
Lead and methylmercury are established developmental toxicants.
Other substances, including certain PFAS, phthalates, and plasticizers, have been associated with reproductive outcomes in observational studies.
These newer findings are important, but they do not establish that every detectable exposure causes harm.
The original 2008 AJOG paper emphasized the importance of environmental history in preconception care.
That principle remains valuable today.
The most informative starting point is often understanding the individual's food, water, home, community, and workplace environments.
From there, meaningful exposures can be investigated and appropriate preventive actions considered.
Preconception environmental health is not about achieving a chemically perfect environment. It is about recognizing avoidable hazards, understanding the evidence, and making practical decisions that support reproductive health.
We believe informed preparation should empower prospective parents—not overwhelm them.
Because the most useful question is not simply what chemicals can be detected.
It is which exposures matter, what the evidence demonstrates, and which actions can make a meaningful difference.
Research References
McDiarmid MA, Gardiner PM, Jack BW. The clinical content of preconception care: environmental exposures. American Journal of Obstetrics and Gynecology. 2008;199(6 Suppl 2)–S361. https://doi.org/10.1016/j.ajog.2008.10.044
Zhang Y, et al. Association of parental preconception exposure to phthalates and phthalate substitutes with preterm birth. JAMA Network Open. 2020;3(4). https://doi.org/10.1001/jamanetworkopen.2020.2159
Welch BM, et al. Associations between prenatal urinary biomarkers of phthalate exposure and preterm birth: a pooled study of 16 US cohorts. JAMA Pediatrics. 2022;176(9):895–905. https://doi.org/10.1001/jamapediatrics.2022.2252
Association of early pregnancy perfluoroalkyl and polyfluoroalkyl substance exposure with birth outcomes. JAMA Network Open. 2023. https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2805449
Gestational exposure to 10 classes of priority chemicals and birth outcomes in the ECHO cohort. JAMA Network Open. 2026. https://doi.org/10.1001/jamanetworkopen.2026.18883
Hoffman SS, Tang Z, Dunlop A, et al. Impact of prenatal phthalate exposure on newborn metabolome and infant neurodevelopment. Nature Communications. 2025;16:2539. https://doi.org/10.1038/s41467-025-57273-z
Mullin AM, Fleisch AF, Mesaros C, et al. Perfluoroalkyl substances and preterm birth. Journal of Perinatology. 2025;45:539–541. https://doi.org/10.1038/s41372-025-02231-2
Phthalate exposure linked to adverse pregnancy outcomes. Nature Medicine. 2024. https://www.nature.com/articles/d41591-024-00011-7
Association of air purifier usage during pregnancy with adverse birth outcomes: the Japan Environment and Children's Study. BMC Public Health. 2024. https://doi.org/10.1186/s12889-024-20802-4
Barn P, et al. The effect of portable HEPA filter air cleaner use during pregnancy on fetal growth: the UGAAR randomized controlled trial. Environment International. 2018. https://pubmed.ncbi.nlm.nih.gov/30213473/
U.S. Food and Drug Administration and Environmental Protection Agency. Advice About Eating Fish. https://www.fda.gov/food/consumers/advice-about-eating-fish
U.S. Environmental Protection Agency. Protect Your Home's Water. https://www.epa.gov/privatewells/protect-your-homes-water
Agency for Toxic Substances and Disease Registry. PFAS Information for Clinicians: Clinical Evaluation and Management. Updated 2026. https://www.atsdr.cdc.gov/pfas/hcp/clinical-overview/clinical-evaluation-management.html
Agency for Toxic Substances and Disease Registry. Testing for PFAS. https://www.atsdr.cdc.gov/pfas/blood-testing/index.html