Microplastics have been detected in human semen and testicular tissue. Some studies have also found links between plastic exposure and poorer sperm quality. However, researchers have not yet established that everyday microplastic exposure causes infertility in men, or that reducing exposure improves the chance of having a baby.[1–4]
If you are trying to conceive, these findings are a reason for sensible precautions—not a reason to assume your fertility has been damaged. An abnormal sperm test still deserves a proper assessment for recognised causes.
What are microplastics?
Microplastics are small plastic particles measuring less than 5 millimetres. Nanoplastics are smaller still. They can form as larger plastics break down or be released during the use of plastic products. People may encounter them through food, drinking water and airborne dust.[1,2,4]
Plastic particles are different from chemicals associated with plastics, such as bisphenol A (BPA) and phthalates. These exposures may overlap, but evidence about one cannot automatically be applied to the others. A “BPA-free” label does not mean a product is free of plastic particles.[1]
Have microplastics been found in sperm?
Researchers have found microplastics in semen—the fluid that contains sperm—and in testicular tissue. This does not mean that every sperm cell contains plastic or that a man with detectable particles is infertile.[1–3]
Several studies help explain what we know and where uncertainty remains:
Microplastics in testicular tissue
A 2024 study detected plastic polymers in all 23 human testicular samples examined. However, the study's sperm-count analysis was conducted in dogs, not the human samples. These findings do not establish an effect on human fertility.[1]
Associations with semen quality
A 2024 study of 113 men in China found that certain plastic exposures, and exposure to more plastic types, were associated with poorer semen measures. Because measurements were taken at one point in time, the study cannot establish that plastics caused the differences.[2]
Findings from a smaller fertility-centre study
A 2025 study of 45 men attending a fertility centre detected microplastics in 34 semen samples. A trend toward poorer forward sperm movement with one polymer did not reach conventional statistical significance. The study also did not demonstrate a significant association with sperm concentration or total sperm count.[3]
Recent research on exposure and sperm movement
A human study published in November 2026 found that higher levels of certain microplastics in stool were associated with lower total sperm motility. Stool measurements do not directly measure testicular exposure, and the study does not establish causation or prove that a treatment would help.[4]
These findings warrant further research. They do not provide a reliable way to calculate an individual man's fertility risk from his plastic exposure.
How might microplastics affect sperm quality?
Laboratory and animal research suggests several possible mechanisms, including inflammation, oxidative stress and disruption of cells involved in sperm production. Oxidative stress occurs when reactive molecules overwhelm the body's protective systems and can damage cells.[1,2]
However, experimental doses, particle sizes and exposure methods can differ substantially from everyday human exposure. A harmful effect in an animal or laboratory experiment does not tell us how much risk a person faces.
Human research also has practical challenges. Studies use different detection methods, contamination during collection or testing must be controlled, and factors such as smoking, weight and other exposures may influence the findings.[1–4]
Sperm count, movement and shape are useful measures, but they are not the same as pregnancy or live-birth outcomes. We still need stronger evidence connecting male microplastic exposure with those outcomes.
Can microplastics cause low testosterone or infertility?
Current human evidence does not establish that typical microplastic exposure causes low testosterone or infertility in an individual man. It also cannot determine how much of any population-level decline in sperm quality is attributable to microplastics.[1–4]
Male infertility can involve hormonal problems, impaired sperm production, obstruction and other conditions. Environmental exposure is one part of a broader assessment.[5,6]
Read more about male infertility assessment and reproductive urology.
Should I have a microplastics test?
Routine blood or semen testing for microplastics is not part of the standard male infertility assessment described in current EAU or AUA/ASRM guidelines. There is no established result that reliably identifies microplastics as the cause of a man's fertility problem or selects an effective treatment.[5,6]
A standard semen analysis is more useful when investigating fertility. It assesses sperm numbers, movement and shape. An abnormal result may need repeating because semen quality varies.[5,6]
The Semen Analysis Interpreter can help explain the terms in your report. It is an educational tool and does not replace clinical assessment.
Can reducing plastic exposure improve sperm quality?
We do not yet have good clinical evidence that avoiding plastic products improves sperm quality, natural conception or live-birth rates. Nevertheless, modest changes that reduce unnecessary exposure are reasonable if they are practical and affordable.
For example, a laboratory study found that some plastic food containers released particles during use, with microwave heating producing the greatest release under the conditions tested.[7] This supports a precautionary approach to food handling, but it was not a fertility-treatment study.
Practical options include:
Use microwave-safe glass or ceramic containers when reheating food.
Follow storage and heating instructions, and replace damaged food containers.
Consider glass or stainless-steel drinking bottles where convenient.
Avoid expensive “plastic-free” programmes that promise to restore fertility.
These are precautions, not proven treatments. There is no need to replace every plastic item in your home or delay fertility care while trying to eliminate exposure.
What should men trying to conceive prioritise?
Urological guidelines place greater emphasis on established assessment and modifiable health factors. Stopping smoking, avoiding heavy alcohol intake, maintaining a healthy weight and regular physical activity are sensible priorities.[5]
Tell your clinician about medicines, anabolic steroids, testosterone use and occupational exposures. Do not change prescribed treatment without advice. The AUA/ASRM guideline also emphasises that evidence for many environmental risk factors remains limited.[6]
There is no established “microplastic detox” treatment for male infertility. Supplements and antioxidants should not be presented as proven ways to remove plastic particles or restore fertility; their clinical benefits in male infertility remain uncertain.[5,6]
When should you seek a male fertility assessment?
Seek advice if pregnancy has not occurred after 12 months of regular unprotected intercourse, or earlier when your partner's age or either partner's medical history makes delay inappropriate. Assessment is commonly recommended after six months when the female partner is 35 or older.[5,6]
Earlier review is also appropriate for an abnormal semen result, known testicular problems or difficulty with ejaculation. Both partners should be considered together.[5,6]
Assessment may include your medical and reproductive history, examination, semen testing and selected hormone or other investigations. Testing should be tailored to the findings.[5,6]
Male fertility care in Brisbane, and for interstate and international patients
Dr Jack Crozier is a urologist and andrologist in Brisbane who assesses male fertility problems, including abnormal semen results, low sperm counts and azoospermia.
If you have an abnormal semen analysis or difficulty conceiving, a consultation can help clarify possible causes and appropriate next steps. Treatment depends on the diagnosis; concern about microplastics alone does not mean you need surgery.
Local and interstate patients can request a male fertility appointment. Include existing semen results and relevant investigations when preparing for your consultation.
Patients outside Australia can review the international patient information. Remote assessment may be possible in selected circumstances, subject to suitability and local requirements. Confirm the assessment plan before arranging travel.
Frequently asked questions
Does finding microplastics in semen mean I cannot have children?
No. Detection alone does not diagnose infertility or predict whether you can conceive. The research describes exposure and possible associations, not a definitive fertility test.[1–4]
Should I postpone trying for a baby while reducing plastic exposure?
There is no established microplastic “washout” period or evidence-based reason to postpone conception solely for this purpose. Any timing decision should take account of both partners' ages, health and fertility history.[5,6]
Can IVF remove the effects of microplastics?
IVF and ICSI should not be described as treatments that remove or reverse microplastic effects. Assisted reproduction is considered according to the couple's fertility circumstances, not simply suspected plastic exposure.[5,6]
References and evidence summary
Hu CJ, Garcia MA, Nihart A, Liu R, Yin L, Adolphi N, et al. Microplastic presence in dog and human testis and its potential association with sperm count and weights of testis and epididymis. Toxicol Sci. 2024;200(2):235–240. doi:[10.1093/toxsci/kfae060](https://doi.org/10.1093/toxsci/kfae060). Human tissue detection study with reproductive measurements in dogs; not proof of human infertility.
Zhang C, Zhang G, Sun K, Ren J, Zhou J, Liu X, 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](https://doi.org/10.1016/j.ebiom.2024.105369). Cross-sectional study of 113 men reporting associations with semen quality; causation remains unproven.
Guo Y, Rong M, Fan Y, Teng X, Jin L, Zhao Y. The presence of microplastics in human semen and their associations with semen quality. Toxics. 2025;13(7):566. doi:[10.3390/toxics13070566](https://doi.org/10.3390/toxics13070566). Small study; the reported progressive-motility difference had a p value of 0.056 and should not be described as statistically significant.
Zhang Y, Han L, Wu Y, Zhang Q, Wei Y, Ge W, et al. Association between microplastic exposure and reduced semen quality and the mediating role of gut microbiota. Front Public Health. 2026;14:1975461. doi:[10.3389/fpubh.2026.1975461](https://doi.org/10.3389/fpubh.2026.1975461). Observational study linking certain stool microplastic measurements with sperm motility; proposed gut mechanisms remain exploratory.
European Association of Urology. EAU Guidelines on Sexual and Reproductive Health: male infertility [Internet]. Arnhem: EAU; 2026 [cited 2026 Nov 6]. Available from: EAU male infertility guideline. Guidance on assessment, lifestyle factors and treatment according to the underlying diagnosis.
American Urological Association; American Society for Reproductive Medicine. Diagnosis and treatment of infertility in men: AUA/ASRM guideline (2020; amended 2024) [Internet]. Linthicum: AUA; 2024 [cited 2026 Nov 6]. Available from: AUA/ASRM guideline. Notes limited evidence for many environmental risk factors and uncertain clinical benefits of supplements.
Hussain KA, Romanova S, Okur I, Zhang D, Kuebler J, Huang X, et al. Assessing the release of microplastics and nanoplastics from plastic containers and reusable food pouches: implications for human health. Environ Sci Technol. 2023;57(26):9782–9792. doi:[10.1021/acs.est.3c01942](https://doi.org/10.1021/acs.est.3c01942). Laboratory research on particle release; it did not test human fertility outcomes.
Medical disclaimer
This article provides general education and does not replace individual medical advice, diagnosis or treatment. Research on microplastics and reproductive health is evolving, and associations do not establish cause and effect. Investigation and treatment should be based on your circumstances and assessment by a qualified clinician. No treatment or fertility outcome can be guaranteed. Do not start or stop prescribed medicines, use detox products or delay recommended fertility care because of this article.
