Cross SectionalHumann = 402024
Prevalence and implications of microplastic contaminants in general human seminal fluid: A Raman spectroscopic study.
Plain-language summary
This study set out to see whether microplastics turn up in semen in ordinary men with no plastics job, and whether they track with sperm quality. Researchers took semen from 40 men attending premarital health checks in Jinan, China, identified the plastics in it, and measured sperm movement and shape. Microplastics were in every single sample, and polystyrene was the most common. Semen containing polystyrene had higher sperm movement than semen containing polyvinyl chloride. That is a comparison between two plastics and not against clean semen, so it does not mean polystyrene is good for sperm, only that PVC looked worse than polystyrene here. Abnormally shaped sperm turned up but did not track with any particular plastic.
Key findings
- Microplastics were found in every semen sample, in men with no occupational plastics exposure.
- Polystyrene was the most common plastic found.
- Semen containing polystyrene had higher sperm movement than semen containing polyvinyl chloride. Both are plastics, so this ranks two exposures against each other rather than showing either one is harmless.
- Abnormally shaped sperm were seen, and no relationship was found between them and any particular plastic.
How to analyze the study yourself
- Study type
- Cross-sectional studies measure exposure and outcome at the same time, so they can show associations but cannot prove cause and effect.
- Population
- Men undergoing premarital health assessments in Jinan, China.
- Funding
- Not reported
- Takeaway
- This study found microplastics in the semen of every one of 40 ordinary men, none of whom worked with plastics. The one comparison it makes is between two plastics, so nothing here says any of them is safe. If you are trying to conceive, it may be worth cutting the plastic you can control, starting with food packaging and heated plastic containers.