Microplastics and Trying to Conceive: What Couples Need to Know

A Hidden Factor in the Fertility Crisis

Global fertility rates have been declining for decades, and sperm counts in Western nations have dropped by more than 50% since 1973 according to a comprehensive 2022 meta-analysis published in Human Reproduction Update. While many factors contribute to declining fertility, including age, stress, and lifestyle changes, a growing body of evidence points to an underappreciated culprit: microplastics and the endocrine-disrupting chemicals they carry.

In 2024, researchers made a startling discovery that brought this issue into sharp focus. A study published in Toxicological Sciences detected microplastics in human testicular tissue for the first time, finding an average concentration of 329.44 micrograms per gram of tissue, nearly three times the concentration found in human placentas. The most common plastic found was polyethylene, followed by PVC. The researchers noted an inverse correlation between microplastic concentration and sperm count in the tissue samples.

For couples who are trying to conceive or planning to start a family, this research highlights the importance of addressing microplastic exposure as part of preconception planning. The encouraging news is that many sources of exposure are modifiable, and starting a plastic reduction plan 3 to 6 months before trying to conceive gives your body time to clear accumulated chemicals.

How Microplastics Affect Female Fertility

Endocrine Disruption and Ovarian Function

Female fertility depends on a precisely orchestrated cascade of hormones. Follicle-stimulating hormone (FSH) triggers egg development, luteinizing hormone (LH) triggers ovulation, and estrogen and progesterone prepare the uterine lining for implantation. Microplastics and their associated chemicals disrupt this hormonal balance at multiple points.

BPA and phthalates are xenoestrogens, chemicals that mimic or interfere with estrogen signaling. Even at low doses, these chemicals can suppress FSH production, leading to incomplete egg maturation. They can alter the timing of the LH surge, leading to irregular or absent ovulation. They can reduce the quality of the uterine lining, making implantation less likely. And they can impair the function of the corpus luteum, reducing progesterone production needed to sustain early pregnancy.

A 2023 study published in Fertility and Sterility found that women with higher urinary concentrations of phthalate metabolites had a 29% longer time to pregnancy compared to women with lower concentrations. Another study from the same year found that BPA exposure was associated with reduced ovarian reserve, as measured by anti-Mullerian hormone (AMH) levels, in women under 35.

Impact on Egg Quality

Beyond hormonal disruption, microplastics may directly affect egg quality. A 2024 study using mouse models found that exposure to polystyrene nanoplastics caused oxidative stress in ovarian tissue, leading to increased rates of DNA damage in oocytes, impaired mitochondrial function in developing eggs, and accelerated follicular atresia (premature death of developing eggs). While direct human evidence is still being gathered, these findings are consistent with epidemiological data showing associations between plastic chemical exposure and reduced oocyte quality in IVF patients.

Endometriosis and Fibroids

Microplastic-associated chemicals have been linked to conditions that impair fertility. Phthalate exposure has been associated with increased risk of endometriosis, a condition where uterine tissue grows outside the uterus, causing pain and reducing fertility. A 2022 meta-analysis found that women with endometriosis had significantly higher urinary phthalate levels than controls. Similarly, BPA exposure has been linked to increased risk of uterine fibroids, which can interfere with embryo implantation and increase miscarriage risk.

How Microplastics Affect Male Fertility

Microplastics in Testicular Tissue

The 2024 discovery of microplastics in human testes was a watershed moment for understanding male fertility decline. The study, conducted at the University of New Mexico, analyzed testicular tissue from 23 human donors and 47 dogs. Every single sample contained microplastics. The human samples contained concentrations nearly three times higher than what had been found in human placentas, suggesting that the testes may be particularly susceptible to microplastic accumulation.

The researchers found 12 different types of plastic in testicular tissue, with polyethylene (used in plastic bags and bottles) comprising 23% of the total, followed by PVC at 16%. Most concerning was the finding that higher microplastic concentrations in testicular tissue correlated with lower sperm counts. While the study examined post-mortem tissue and could not assess fertility directly, the implications for male reproductive health are significant.

Sperm Quality Decline

Multiple studies have linked plastic chemical exposure to measurable declines in sperm parameters. A 2023 study of 1,045 men from fertility clinics found that those with higher urinary BPA concentrations had 23% lower sperm concentration, 13% lower sperm motility, and a higher proportion of abnormally shaped sperm compared to those with lower BPA levels. Phthalate exposure has been similarly associated with reduced sperm DNA integrity, with a 2024 study finding that men in the highest quartile of phthalate exposure had twice the rate of sperm DNA fragmentation compared to the lowest quartile.

These effects are particularly concerning because sperm development (spermatogenesis) takes approximately 74 days, meaning that current plastic chemical exposure is affecting sperm that will be used in conception attempts two to three months from now. This is why starting a preconception detox plan at least 3 months before trying to conceive is recommended.

Testosterone and Hormonal Effects

Phthalates are potent anti-androgens that can suppress testosterone production. A 2023 meta-analysis of 18 studies found a significant inverse association between urinary phthalate metabolite levels and serum testosterone concentrations in adult men. Reduced testosterone not only impairs sperm production but can also decrease libido and sexual function, further reducing the chances of conception. BPA exposure has additionally been linked to elevated estradiol levels in men, disrupting the testosterone-to-estrogen ratio that is critical for healthy sperm production.

Microplastics and IVF Success Rates

For couples undergoing assisted reproductive technologies, microplastic exposure adds another variable to an already complex process. Several studies have examined the relationship between plastic chemical exposure and IVF outcomes.

A landmark study from the Harvard T.H. Chan School of Public Health tracked 256 women undergoing IVF cycles and measured urinary phthalate metabolites before and during treatment. Women in the highest quartile of di(2-ethylhexyl) phthalate (DEHP) exposure had 55% lower odds of clinical pregnancy and 56% lower odds of live birth compared to those in the lowest quartile. The researchers concluded that phthalate exposure may impair oocyte quality, embryo development, and implantation.

BPA exposure has been associated with fewer oocytes retrieved during IVF, lower fertilization rates, reduced embryo quality scores, and thinner endometrial lining at the time of embryo transfer. A 2024 study found that women with BPA levels above the median had 34% fewer top-quality embryos available for transfer compared to those below the median.

These findings suggest that reducing plastic chemical exposure before and during IVF treatment may improve outcomes. Several fertility clinics have begun recommending plastic reduction protocols as part of their pretreatment guidance, though this practice is not yet universal.

Creating a Preconception Detox Plan

The ideal time to begin reducing microplastic exposure is 3 to 6 months before trying to conceive. This timeline allows the body to clear accumulated plastic chemicals (BPA has a half-life of approximately 6 hours in blood, but phthalates and PFAS persist longer) and ensures that a full cycle of sperm development (74 days) occurs under reduced-exposure conditions.

Diet Changes for Both Partners

• Eliminate plastic food storage. Transfer all food to glass or stainless steel containers. Never heat food in plastic, including takeout containers.
• Filter your drinking water. Install a reverse osmosis system or use a high-quality carbon block filter. Avoid bottled water in plastic, which can contain hundreds of thousands of microplastic particles per bottle.
• Eat organic when possible. Organic produce has lower pesticide residues, and many pesticides are formulated with plastic adjuvants. Prioritize the “Dirty Dozen” (strawberries, spinach, kale, peaches, pears, nectarines, apples, grapes, bell peppers, cherries, blueberries, green beans) for organic purchases.
• Reduce processed food intake. Each step of food processing introduces potential plastic contamination from equipment and packaging. Cook from whole ingredients when possible.
• Choose seafood carefully. Opt for wild-caught fish over farmed, avoid shellfish consumed whole (mussels, oysters), and focus on species with lower microplastic accumulation such as salmon, sardines, and mackerel.
• Avoid canned foods. Choose foods in glass jars, frozen alternatives, or Tetra Pak packaging when fresh is not available.

Lifestyle Changes for Both Partners

• Switch to natural-fiber clothing. Choose organic cotton, wool, linen, and hemp over polyester and nylon, especially for underwear and clothing worn closest to the body. Synthetic fabrics shed microplastic fibers that are absorbed through the skin.
• Replace plastic personal care products. Choose phthalate-free, fragrance-free products for both partners. Men's grooming products (aftershave, deodorant, shampoo) often contain high levels of phthalates.
• Improve indoor air quality. Vacuum with a HEPA filter regularly, ventilate your home daily, and consider a HEPA air purifier for the bedroom to reduce airborne microplastic fiber exposure during sleep.
• Avoid receipts and thermal paper. Thermal paper receipts are coated with BPA or BPS, which absorbs through the skin on contact. Use digital receipts when possible and avoid handling thermal paper.
• Do not dry clean clothing. Dry cleaning chemicals include perchloroethylene and other solvents carried in plastic-lined garment bags. If dry cleaning is necessary, remove the plastic bag and air out garments before wearing.

Male-Specific Recommendations

• Avoid heat exposure to the groin area. Do not use laptops on your lap, avoid hot tubs and saunas, and wear loose-fitting cotton underwear. Heat combined with microplastic chemical exposure may have synergistic effects on sperm quality.
• Reduce plastic-packaged beverage consumption. Avoid drinking from plastic water bottles, especially those that have been exposed to heat or sunlight. Switch to glass or stainless steel.
• Minimize exposure to vinyl and PVC. Avoid vinyl shower curtains, PVC flooring, and plastic car interiors that off-gas phthalates, especially when heated. Use car window shades and ventilate your car before entering on hot days.

Supplements That May Help Counteract Plastic Chemical Effects

While reducing exposure is the primary strategy, certain supplements have shown promise in mitigating the effects of plastic chemical exposure on fertility. Always consult your healthcare provider before starting any supplement regimen, especially when trying to conceive.

• N-Acetyl Cysteine (NAC): A powerful antioxidant that increases glutathione levels, supporting the body's ability to detoxify plastic chemicals. A 2023 study found that NAC supplementation improved sperm parameters in men with high oxidative stress.
• Coenzyme Q10 (CoQ10): Supports mitochondrial function in both eggs and sperm. Studies have shown improved egg quality in IVF patients and improved sperm motility in men taking 200-600 mg daily.
• Folate (not folic acid): Methylfolate (the active form) supports DNA methylation, which may help counteract epigenetic changes caused by plastic chemicals. Critical for both egg and sperm quality.
• Vitamin D: Deficiency is linked to infertility in both sexes. Vitamin D also supports the body's detoxification pathways. Target blood levels of 40-60 ng/mL.
• Omega-3 fatty acids: DHA and EPA reduce inflammation caused by microplastic exposure. A 2024 study found that omega-3 supplementation partially reversed the anti-androgenic effects of phthalate exposure in men.
• Selenium: An essential trace mineral that supports glutathione peroxidase activity, a key enzyme in detoxifying reactive oxygen species generated by plastic chemical exposure. Important for sperm quality.

Your Preconception Plastic Reduction Checklist

Use this checklist to systematically reduce your plastic exposure in the months before trying to conceive:

• Replace all plastic food storage with glass or stainless steel
• Install a water filter (reverse osmosis or carbon block)
• Switch to stainless steel or glass water bottles
• Replace nonstick cookware with cast iron or stainless steel
• Switch to fragrance-free, phthalate-free personal care products (both partners)
• Replace polyester underwear and close-body clothing with organic cotton
• Audit cosmetics and skincare for microplastic ingredients
• Replace plastic cutting boards with wood or bamboo
• Switch from plastic tea bags to loose-leaf tea
• Reduce canned food consumption; choose glass jars or frozen alternatives
• Improve home air quality: HEPA vacuum, regular ventilation, air purifier
• Decline paper receipts or use digital alternatives
• Replace vinyl shower curtain with fabric alternative
• Begin fertility-supporting supplements (consult your doctor)
• Scan everyday products with the MicroPlastics app to identify hidden plastic ingredients

Frequently Asked Questions

How long before trying to conceive should we start reducing plastic exposure?

Ideally, begin 3 to 6 months before trying to conceive. Sperm development takes approximately 74 days, so men need at least 3 months for a full cycle of sperm to develop under reduced-exposure conditions. For women, egg maturation takes about 90 days from recruitment to ovulation. Six months gives both partners the best chance of meaningful improvement in gamete quality. However, starting at any point is beneficial, as some plastic chemicals like BPA are cleared from the blood within hours of reducing exposure.

Can microplastic exposure cause infertility, or does it just reduce fertility?

Current evidence suggests that microplastic and plastic chemical exposure reduces fertility rather than causing absolute infertility. The effects are dose-dependent and cumulative, meaning that higher and longer exposures have greater impacts. For most people, plastic chemical exposure is one of many factors affecting fertility. Reducing exposure can improve your chances of conception, particularly when combined with other healthy lifestyle changes. However, if you have been trying to conceive for more than 12 months (or 6 months if over 35), consult a reproductive endocrinologist regardless of plastic exposure.

Does reducing plastic exposure improve IVF success rates?

Several studies suggest it may. Research has shown that women with lower phthalate and BPA levels at the time of IVF treatment have higher fertilization rates, better embryo quality, and higher clinical pregnancy rates. While no randomized controlled trial has directly tested whether reducing plastic exposure before IVF improves outcomes, the observational evidence is strong enough that many fertility specialists now recommend plastic reduction as part of IVF preparation protocols.

Are organic foods important for fertility?

A 2018 study in JAMA Internal Medicine found that women who ate more organic produce had higher rates of clinical pregnancy and live birth during IVF treatment. While the study attributed this to lower pesticide exposure, many pesticide formulations contain plastic adjuvants and are packaged in plastic. Eating organic also tends to mean less processed food and less plastic packaging, indirectly reducing microplastic exposure. Prioritize organic for the produce you eat most frequently and for items on the “Dirty Dozen” list.

My partner is skeptical about plastic reduction. How do I get them on board?

Share the specific research on testicular microplastics and sperm quality decline. The 2024 study finding microplastics in every testicular tissue sample tested, with concentrations correlating inversely with sperm count, is often compelling for skeptical partners. Emphasize that many changes are simple (switching from plastic to glass water bottles, for example) and benefit overall health beyond fertility. Start with the easiest changes first and build from there. The MicroPlastics app can help by making the invisible visible: scanning everyday products and seeing their microplastic risk scores can make the issue feel more concrete and actionable.