If you’re trying to conceive, you’ve probably looked into nutrition, exercise, sleep, and stress management. Those things matter. But there’s another factor that gets far less attention in mainstream fertility advice: the chemicals in your everyday environment.

The research connecting environmental chemical exposure to fertility problems is substantial and growing. Sperm counts in Western countries have declined by roughly 50% over the past four decades. Female fertility indicators, including egg quality and hormonal regularity, show similar trends. While lifestyle and dietary changes play a role, researchers increasingly point to endocrine-disrupting chemicals as a significant contributing factor.

According to NonToxicLab, preconception chemical exposure is one of the most underserved topics in the non-toxic living space, and it deserves more attention than it gets.

This isn’t about creating panic. It’s about giving you information that most fertility clinics don’t cover, and that can make a real difference in your odds of conception.

The Science Behind Chemical Fertility Effects

Your reproductive system runs on hormones. Estrogen, progesterone, testosterone, FSH, LH, and a cascade of other signaling molecules have to be present in the right amounts, at the right times, in the right ratios. Endocrine-disrupting chemicals (EDCs) interfere with this system by mimicking hormones, blocking hormone receptors, or altering hormone production and metabolism.

Dr. Shanna Swan, a reproductive epidemiologist at Mount Sinai, has spent over 20 years researching this topic. Her findings have documented that phthalate exposure is associated with declining sperm counts, reduced testosterone levels, shorter anogenital distance (a marker of reproductive health in both sexes), and disrupted ovarian function. Her work was among the first to establish that these effects occur at exposure levels considered “normal” in the general population, not just at high industrial exposure levels.

The implications are unsettling. The chemicals contributing to these trends are in products you use every day, in concentrations that regulatory agencies have deemed safe, but that the reproductive health research community considers concerning.

The Chemicals That Matter Most for Fertility

Phthalates

Phthalates are plasticizer chemicals found in fragrance, flexible plastics, food packaging, and personal care products. They’re in your shampoo (hidden under “fragrance”), your vinyl shower curtain, your plastic food containers, and your dryer sheets.

How they affect fertility:

  • In men: Reduced sperm count, lower sperm motility, abnormal sperm morphology, lower testosterone
  • In women: Disrupted ovarian function, lower antral follicle count (a measure of ovarian reserve), increased time to pregnancy
  • In both: Phthalates interfere with steroidogenesis, the process by which your body produces sex hormones

Biggest exposure sources: Synthetic fragrance in personal care products is the number one source of phthalate exposure for most people. Diethyl phthalate (DEP) is used as a solvent in fragrance, and it absorbs through the skin and is detectable in urine within hours. See our what does fragrance mean on a label guide for more.

BPA and Bisphenol Analogs

BPA (bisphenol A) is a synthetic estrogen found in polycarbonate plastics, canned food linings, thermal receipt paper, and some dental sealants. It mimics estrogen at very low concentrations.

How it affects fertility:

  • In women: Associated with reduced egg quality, lower IVF success rates, polycystic ovary syndrome (PCOS), and early puberty
  • In men: Associated with lower sperm count and quality
  • BPA crosses the placental barrier, so preconception exposure directly affects the embryo’s chemical environment from day one

The BPA-free problem: Many products marketed as BPA-free use replacement chemicals (BPS, BPF, BPAF) that have similar estrogenic activity. Dr. Swan has described this pattern as regrettable substitution, where the replacement hasn’t been adequately tested before being put into widespread use. Glass and stainless steel containers avoid the entire class of bisphenol chemicals. See our what is BPA guide for a full breakdown.

PFAS (Forever Chemicals)

PFAS are found in nonstick cookware, waterproof clothing, food packaging, and contaminated drinking water. They’re called “forever chemicals” because they don’t break down in the environment or in your body.

How they affect fertility:

  • Associated with longer time to pregnancy
  • Linked to endometriosis, which can impair fertility
  • In men, associated with reduced semen quality
  • PFOS (a specific PFAS compound) has been linked to reduced fecundability (the monthly probability of conception)

A 2019 study in the Journal of Clinical Endocrinology and Metabolism found that women with higher blood PFAS levels took significantly longer to conceive. The effect was dose-dependent, meaning higher PFAS exposure correlated with longer time to pregnancy.

See our what are PFAS guide for detailed information on exposure sources and reduction strategies.

Pesticides

Organophosphate pesticides, used on conventionally grown fruits and vegetables, have been linked to fertility effects in both sexes. A 2018 study in JAMA Internal Medicine found that women who ate more high-pesticide-residue fruits and vegetables had a lower probability of successful pregnancy through IVF. The effect wasn’t seen with low-pesticide-residue produce.

Dr. Philip Landrigan has researched pesticide exposure and reproductive health outcomes, noting that the developing reproductive system is particularly sensitive to organophosphate interference during the preconception and early pregnancy periods. His work underscores that dietary pesticide exposure, while lower than occupational exposure, is chronic and cumulative.

Flame Retardants

Polybrominated diphenyl ethers (PBDEs) and newer flame retardant chemicals found in furniture foam, electronics, and older mattresses are endocrine disruptors that have been linked to longer time to pregnancy and lower IVF success rates. They accumulate in body fat and have been detected in follicular fluid (the fluid surrounding eggs in the ovary).

Room-by-Room Fertility Cleanup

Reducing your chemical exposure when trying to conceive doesn’t need to happen all at once. Here’s a practical approach organized by room and priority.

Kitchen

The kitchen matters because food contact exposure is one of the most direct pathways into your body.

Swap plastic food storage for glass or stainless steel. This eliminates BPA, BPS, and phthalate exposure from food containers. Especially stop microwaving food in plastic. See our best non-toxic food storage guide.

Switch to non-toxic cookware. Nonstick coatings (PTFE/Teflon) can release PFAS-related compounds when scratched or overheated. Stainless steel, cast iron, and carbon steel are safer choices. See our best non-toxic cookware guide.

Filter your drinking water. A reverse osmosis or high-quality carbon block filter removes PFAS, lead, and pesticide residues. See our water filtration complete guide.

Buy organic for the Dirty Dozen. If budget is a constraint, prioritize organic versions of the fruits and vegetables with the highest pesticide residues: strawberries, spinach, kale, peaches, pears, nectarines, apples, grapes, bell peppers, cherries, blueberries, and green beans.

Bathroom

Personal care products are a primary source of phthalate and paraben exposure. The products you put on your skin absorb into your bloodstream.

Switch to fragrance-free personal care products. This is the single most impactful swap for phthalate reduction. Replace shampoo, conditioner, body wash, lotion, and deodorant with fragrance-free alternatives. See our best non-toxic shampoo guide and best non-toxic body lotion guide.

Avoid products with parabens. Methylparaben and propylparaben are estrogen mimics commonly used as preservatives. Check ingredient lists or use EWG’s Skin Deep database.

Replace your shower curtain if it’s PVC. The phthalates from a vinyl shower curtain are a daily inhalation exposure in a small, steamy room. See our best non-toxic shower curtain guide.

Bedroom

You spend 7-9 hours in your bedroom every night. The materials in your mattress, bedding, and the air quality of this room affect you for a third of your life.

Consider your mattress. Conventional mattresses contain polyurethane foam with flame retardants, which accumulate in body fat and have been found in follicular fluid. If you’re not ready to replace your mattress, an organic cotton or wool mattress topper creates a barrier. See our best non-toxic mattresses guide.

Wash bedding in fragrance-free detergent. Your sheets, pillowcases, and blankets are in contact with your skin all night. Fragrance in laundry detergent means phthalate residue on every surface you sleep on. See our best non-toxic laundry detergent guide.

Living Areas

Dust regularly with a damp cloth. Household dust is a reservoir for flame retardants, PFAS, phthalates, and lead. Regular damp-dusting and HEPA vacuuming reduces the concentration of these chemicals in your home.

Avoid air fresheners, plug-ins, and scented candles. These are direct sources of synthetic fragrance chemicals.

Ventilate your home. Open windows when weather permits to dilute indoor chemical concentrations.

For Men: What the Research Shows

Male fertility is equally affected by chemical exposure, and some researchers argue that sperm are more sensitive to EDC interference than eggs because sperm production is a continuous process. Every 74 days, your body produces an entirely new batch of sperm, and the chemical environment during that production window directly affects sperm quality.

Dr. Shanna Swan’s research has documented a roughly 50% decline in sperm counts among Western men between 1973 and 2011. While the causes are multifactorial, her work identifies endocrine-disrupting chemical exposure as a significant contributor. She has found measurable associations between phthalate metabolite levels in men’s urine and reduced sperm count, motility, and morphology.

Practical steps for men:

  • Switch personal care products to fragrance-free (phthalates in cologne and aftershave are absorbed through facial skin)
  • Avoid carrying a phone in your front pants pocket (heat plus EMF may affect sperm; the evidence is mixed but the precaution is free)
  • Don’t put hot food in plastic containers
  • Avoid thermal receipt paper (handle receipts briefly or decline them; BPA absorbs through skin)
  • Eat organic when possible
  • Filter drinking water

For Women: What the Research Shows

Female fertility is affected by EDCs through several pathways: egg quality, ovarian reserve, hormonal balance, endometrial receptivity, and implantation success. Some effects are reversible with exposure reduction; others, particularly those affecting ovarian reserve, are not.

Dr. Leonardo Trasande has documented the economic health costs of endocrine disruptor exposure in women, including fertility treatment costs attributable to EDC-related conditions like endometriosis and PCOS. His research makes the case that reducing chemical exposure is both a health intervention and an economic one.

Practical steps for women:

  • Prioritize fragrance-free personal care (lotion, body wash, shampoo are highest-exposure products)
  • Avoid retinol/retinoid products (not an EDC issue but a known teratogen; discontinue before trying to conceive)
  • Switch to mineral sunscreen (chemical sunscreen ingredients like oxybenzone have estrogenic activity). See our best non-toxic sunscreen guide.
  • Avoid nail polish containing the “toxic trio” (toluene, formaldehyde, dibutyl phthalate). See our best non-toxic nail polish guide.

Timeline: When to Start Cleaning Up

The preconception period matters. Sperm take approximately 74 days to develop, and egg maturation takes about 90 days. Chemical exposure during these windows directly affects the quality of the sperm and eggs that will be involved in conception.

Ideally, start 3-6 months before trying to conceive. This gives your body time to clear some of the stored chemicals and allows the next generation of eggs and sperm to develop in a cleaner chemical environment.

If you’re already trying, start now. Any reduction in exposure is an improvement, and most of the practical steps are things you’d want to maintain through pregnancy anyway.

What About Fertility Treatments?

If you’re undergoing IVF or IUI, reducing chemical exposure is still relevant. Several studies have found associations between EDC exposure levels and IVF outcomes:

  • Higher urinary phthalate metabolites have been associated with lower oocyte yield and lower fertilization rates
  • Higher BPA levels have been associated with lower implantation rates
  • PFAS exposure has been linked to reduced ovarian response to stimulation

Reducing exposure during a treatment cycle may improve outcomes, though no study has definitively proven causation. Given that the interventions are low-cost and low-risk (switching to glass food storage, using fragrance-free products), they’re reasonable steps regardless.

Common Questions

How quickly do chemical levels drop after making changes?

It depends on the chemical. Phthalates have short half-lives (hours to days) and clear from your body quickly once you reduce exposure. You can see measurable drops in urinary phthalate metabolites within 48-72 hours of switching to fragrance-free products. BPA also clears within days. PFAS, however, have half-lives measured in years. Flame retardants stored in body fat take months to years to decline. This is why starting early helps, but even late changes make a difference for the fast-clearing chemicals.

Do I need to buy all organic food?

No. A fully organic diet isn’t necessary or affordable for most people. Focus organic spending on the EWG’s Dirty Dozen list (the produce with the highest pesticide residues). Conventional fruits and vegetables from the “Clean Fifteen” list have minimal residues and are fine to buy non-organic. The overall dietary pattern matters more than perfection on any single item.

Can men really affect fertility with product switches?

Absolutely. Sperm quality is sensitive to chemical exposure, and the research on phthalates and male reproductive function is solid. Switching to fragrance-free products, using glass food containers, and filtering drinking water are changes that reduce the chemical burden on sperm production. The 74-day sperm production cycle means that changes made today affect sperm quality roughly 2.5 months from now.

Is this why so many couples need fertility treatments?

Environmental chemicals are one factor among many, and no researcher claims they’re the sole cause of rising infertility rates. Age at first pregnancy, lifestyle factors, and underlying medical conditions all play roles. But the population-level trends in declining sperm counts and fertility indicators, combined with the mechanistic evidence for how EDCs interfere with reproduction, suggest that chemical exposure is a meaningful contributor that deserves attention alongside the more commonly discussed factors.

Should I get my chemical exposure levels tested?

Testing is available but not routinely covered by insurance. Urinary phthalate metabolites and blood PFAS levels can be measured through specialty labs. The results can motivate behavior change, but the practical advice is the same regardless of test results: reduce exposure from the major sources. If you’re curious, discuss testing with your reproductive endocrinologist or a physician familiar with environmental health.

You Might Also Like

Sources