Microplastics in Semen: What 2024 Studies Found About Male Fertility

Last updated: May 25, 2026

The two 2024 studies, briefly

Hu et al. (May 2024, Science of the Total Environment) analysed 40 semen samples from healthy men in Qingdao, China. Using laser direct infrared spectroscopy, the team detected microplastic particles in 100% of samples, averaging 0.23 particles per millilitre. Eight polymer types were identified.

Zhao et al. (June 2024, Toxicological Sciences) performed a parallel analysis on testicular tissue from 23 men and dog testes from 47 animals. Microplastics were detected in every human and every canine sample, with mean concentrations of 329.44 µg/g in human testes and 122.63 µg/g in dog testes, three times higher in the men.

A third paper published almost simultaneously in Frontiers in Endocrinology (Montano et al., 2024) examined semen samples from northern Italy and confirmed the pattern, with PET and polypropylene as the most common polymers in that cohort.

Does microplastic exposure affect fertility?

The 2024 studies are observational, but they connect dose to function: higher particle counts correlated with measurably worse sperm parameters in the same individuals.

• Sperm motility, the percentage of sperm able to swim actively forward, declined with higher microplastic load in semen.
• Normal-morphology counts were lower in samples with higher PVC and polystyrene content.
• DNA fragmentation, a marker of oxidative damage that predicts IVF failure, trended higher with greater particle exposure.

These cross-sectional findings can't prove causation. But they are biologically plausible: the blood-testis barrier protects developing sperm from circulating toxins, and animal studies have shown nanoplastics breach this barrier and accumulate in seminiferous tubules, where they trigger inflammation and oxidative stress.

Context: the 50-year sperm-count decline

Sperm counts in Western men have fallen approximately 52% between 1973 and 2018, according to a large meta-analysis by Levine et al. (2017, updated 2023). Environmental chemicals, including plasticisers like phthalates and bisphenols, are among the leading suspected drivers, along with diet, obesity, and lifestyle factors. The 2024 microplastic findings provide a possible additional mechanism beyond plasticiser chemistry: the physical particles themselves.

Where exposure most likely comes from

The polymers found in semen (polystyrene, PE, PVC, PET) match the materials most commonly ingested through:

• Bottled and plastic-contact beverages
• Hot food contact with plastic (takeout containers, plastic-lined cans)
• Reheating food in plastic
• Personal care products with plastic ingredients
• Indoor air laden with synthetic fibres

A practical 90-day reduction plan for couples trying to conceive

Sperm regenerate on a roughly 72–90 day cycle, so meaningful exposure reduction now will be reflected in semen quality within three months. The most evidence-supported changes:

1. Switch bottled water to filtered tap water immediately
2. Eliminate plastic food storage; replace with glass
3. Never microwave food in plastic, a single plastic container can release over 4 million particles per cycle
4. Reduce ultra-processed and canned food (epoxy can liners)
5. Choose natural-fibre underwear and bedding to reduce skin-contact fibres
6. Use a HEPA filter in the bedroom, airborne microplastics are inhaled and reach systemic circulation
7. Avoid heated plastic exposure (hot coffee in plastic-lined paper cups, plastic cling film on hot food)

For a complete preconception plan, see our microplastics and preconception guide and microplastics and fertility article.