Can Microplastics Affect Fertility? What Human and Animal Studies Show

Microplastics may pose a reproductive hazard, but human studies have not established that they cause infertility. Plastic material has been detected in semen, seminal plasma, testicular tissue, and follicular fluid. Some studies report associations with sperm quality, ovarian reserve, or IVF fertilisation, while the stronger evidence for effects on reproductive function still comes from controlled animal experiments.

Quick answer

Current research gives us reasons to investigate microplastics and fertility, not a reason to declare them a proven cause of infertility.

Human studies are mostly small and observational. They can show that plastic material was detected and that higher measurements sometimes appeared alongside poorer reproductive markers. They cannot show which exposure source mattered, whether particles came before the problem, or whether reducing exposure would improve a person's chance of conception.

For the wider evidence picture, start with PFK's microplastics and human health guide.

Three things to know

• Detection is becoming more consistent: Researchers have reported plastic polymers or particles in semen, seminal plasma, testicular tissue, and ovarian follicular fluid.
• Human outcome evidence remains limited: Associations with sperm measures, diminished ovarian reserve, and IVF fertilisation do not establish cause and effect.
• Animal evidence shows possible hazard: Controlled rodent studies report changes in sperm, testes, ovarian follicles, and reproductive hormones, but their particles, doses, and exposure routes do not mirror everyday human exposure.

How the main claims hold up

Claim 1: Have microplastics been found in human reproductive samples?

PFK verdict: Yes, under several methods, but the measurements are not directly interchangeable.

A 2023 study examined six testicular samples and 30 semen samples using complementary imaging and mass-based methods, reporting plastic material in both matrices. A 2024 multi-site study used Raman microscopy to examine semen from 113 men at reproductive-medicine centres in China. It reported microplastics in every sample, usually identifying three to five of the eight targeted polymer types.

Female reproductive evidence is newer. Studies have reported polyethylene, PVC, and other polymers in follicular fluid. The method matters: Raman and infrared imaging can identify individual particles above method-specific size limits, while pyrolysis gas chromatography/mass spectrometry, or Py-GC/MS, measures polymer mass after destroying the sample. A mass result cannot tell us the original particle number, shape, or size.

Claim 2: Do human studies link microplastics with poorer sperm quality?

PFK verdict: Some studies report associations, but none proves that microplastics caused sperm dysfunction.

In the 113-person study, PTFE detection and a greater number of detected polymer types were associated with several poorer semen parameters. The study measured presence or absence rather than a reliable dose. It was cross-sectional, with exposure and sperm quality assessed together.

A separate IVF-centre study of 51 couples measured polyethylene and PVC mass in seminal plasma. Higher PVC was associated with lower sperm motility. The selected clinical group was small, limiting comparisons. PTFE particles must also be kept separate from PFOA and other PFAS chemicals. Evidence about one does not explain an association involving the other.

Claim 3: Do human studies show effects on ovaries or fertilisation?

PFK verdict: The evidence is suggestive and mixed, not a demonstration of impaired human fertility.

The 51-couple IVF study found no significant relationship between follicular-fluid polyethylene or PVC mass and ovarian-reserve markers. It did report lower normal fertilisation rates in groups with higher polyethylene or PVC measurements. IVF fertilisation is an important laboratory outcome, but it is not the same as the chance of conceiving without IVF or having a live birth.

A newer case-control study compared 25 patients with diminished ovarian reserve with 20 patients who had tubal-factor infertility. Total measured plastics, polyethylene, polypropylene, and PVC were higher in the diminished-reserve group. Adjusted models linked polyethylene, PVC, and total measurements with case status, and some measurements were inversely correlated with anti-Müllerian hormone or antral follicle count.

Because all 45 participants came from a fertility-care setting and exposure was measured after group selection, the study cannot determine whether plastic contributed to diminished reserve, accumulated alongside it, or reflected another factor.

Claim 4: What do controlled animal studies add?

PFK verdict: They show reproductive hazard under experimental conditions, not the size of ordinary human risk.

In one study, 105 male mice drank water containing 0.5, 4, or 10 micrometre polystyrene spheres at two concentrations for 180 days. Researchers reported altered testicular tissue, lower sperm viability, more abnormal sperm, and changes in testosterone, LH, and FSH.

A study of 32 female rats exposed to 0.5-micrometre polystyrene for 90 days reported fewer growing follicles, lower anti-Müllerian hormone, oxidative-stress changes, and injury pathways in ovarian granulosa cells. These experiments strengthen biological plausibility, but they used one pristine polymer, fixed particle sizes, controlled doses, and animal endpoints. They do not establish the effect of mixed, weathered particles at everyday human exposure.

Claim 5: Do microplastics cause human infertility?

PFK verdict: Not demonstrated.

No verified prospective general-population study has shown that measured microplastics reduce the monthly chance of conception or cause a diagnosed infertility outcome. Sperm quality, ovarian-reserve markers, and IVF fertilisation are relevant signals, but they cannot answer that larger causal question on their own.

No controlled human trial has shown that reducing measured particles improves fertility.

Practical implications

Anyone facing fertility concerns should rely on a qualified clinician for evaluation and treatment. Research-grade microplastic measurements are not validated fertility tests, and there is no clinical threshold that can classify a person's result as safe or harmful. PFK's guide to microplastics blood-test results explains why detection is not a personal risk score.

If you want to reduce avoidable plastic contact as a general precaution, focus on manageable food-contact choices involving heat, wear, and frequent use. PFK's guide to what to replace first in a lower-plastic kitchen offers a gradual starting point. These choices do not eliminate exposure or promise fertility benefits.

Fertility evidence is separate from what placental and pregnancy studies can show.

PFK assessment: Human fertility studies now show enough detection and association signals to justify better research, but animal hazard evidence should not be presented as proof that everyday microplastic exposure causes infertility in people.

How PFK evaluated these claims

PFK separated particle detection, polymer-mass measurement, reproductive markers, diagnosed fertility outcomes, and intervention evidence. We also checked sample selection, timing, contamination controls, analytical limits, alternative explanations, and how closely animal exposures resemble real human exposure.

That approach supports concern and further study without turning early associations into medical conclusions.

Research reviewed August 1, 2026. This article is for educational purposes and is not medical advice. Speak with a qualified health professional about fertility concerns or treatment decisions.

Sources

1. Zhang C, Zhang G, Sun K, Ren J, et al. “Association of mixed exposure to microplastics with sperm dysfunction: a multi-site study in China.” eBioMedicine. 2024;108:105369. DOI: 10.1016/j.ebiom.2024.105369. PMID: 39342804.
2. Kong F, Fang L, Gui Y, Lan H, et al. “Polyethylene and Polyvinyl Chloride Nanoplastics in Human Follicular Fluid and Seminal Plasma: Impact on Fertilization and Sperm Quality.” ACS Nano. 2025. DOI: 10.1021/acsnano.5c00918. PMID: 40689763.
3. Zhou Y, Lu Y, Luo Y, Li J, et al. “Associations between concentrations of microplastics in follicular fluid and the risk of diminished ovarian reserve.” Journal of Hazardous Materials. 2026;502:140958. DOI: 10.1016/j.jhazmat.2025.140958. PMID: 41485337.
4. Zhao Q, Zhu L, Weng J, Jin Z, et al. “Detection and characterization of microplastics in the human testis and semen.” Science of the Total Environment. 2023;877:162713. DOI: 10.1016/j.scitotenv.2023.162713. PMID: 36948312.
5. Jin H, Yan M, Pan C, Liu Z, et al. “Chronic exposure to polystyrene microplastics induced male reproductive toxicity and decreased testosterone levels via the LH-mediated LHR/cAMP/PKA/StAR pathway.” Particle and Fibre Toxicology. 2022;19:13. DOI: 10.1186/s12989-022-00453-2. PMID: 35177090.
6. Hou J, Lei Z, Cui L, Hou Y, et al. “Polystyrene microplastics lead to pyroptosis and apoptosis of ovarian granulosa cells via NLRP3/Caspase-1 signaling pathway in rats.” Ecotoxicology and Environmental Safety. 2021;212:112012. DOI: 10.1016/j.ecoenv.2021.112012. PMID: 33550074.
7. Chartres N, Cooper CB, Bland G, et al. “Effects of Microplastic Exposure on Human Digestive, Reproductive, and Respiratory Health: A Rapid Systematic Review.” Environmental Science & Technology. 2024. DOI: 10.1021/acs.est.3c09524.
8. Dmitrowicz A, Sacharczuk M, Skiba D. “Micro- and nanoplastics in human biological materials: a systematic review of detection methods and methodological challenges.” Archives of Toxicology. 2026. DOI: 10.1007/s00204-026-04392-1.