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In March 2022, a team of researchers at Vrije Universiteit Amsterdam published a study that changed how we think about plastic pollution. For the first time, microplastics were detected and quantified in human blood1. The finding confirmed what many scientists had suspected: these particles aren’t just in our oceans and food — they’re circulating inside us.

The Study

The team, led by Professor Dick Vethaak, collected blood samples from 22 healthy adult volunteers and analyzed them using a specially adapted technique called pyrolysis–gas chromatography/mass spectrometry. This method heats samples to extreme temperatures and identifies plastics by their chemical fingerprint.

What made this study particularly rigorous was its contamination control. Plastic contamination during lab work is a known problem in microplastics research. The team used steel needles, glass equipment, and blank controls to ensure what they measured came from the blood itself — not the lab.

What They Found

Detectable levels of plastic particles were present in 17 out of 22 donors (77%). The average concentration was 1.6 micrograms per milliliter of blood.

The most commonly detected plastics were:

  • PET (polyethylene terephthalate) — found in 50% of samples. This is the plastic used in drink bottles, food packaging, and synthetic clothing fibers.
  • Polystyrene — found in 36% of samples. Used in disposable food containers, cups, and packaging foam.
  • Polyethylene — found in 23% of samples. The world’s most produced plastic, used in carrier bags, food wrapping, and squeeze bottles.

Notably, concentrations varied widely between individuals. Some donors had two to three times the plastic load of others, suggesting that daily habits and environmental exposure play a significant role.

Where Do These Microplastics Come From?

Research points to several primary exposure routes2:

  • Food and drink packaging — plastics leach into food, especially when heated. A single plastic tea bag releases roughly 11.6 billion microplastic particles per cup3.
  • Drinking water — bottled water contains significantly more microplastic particles than tap water. One study found an average of 325 particles per liter in bottled water4.
  • Airborne particles — synthetic textiles, car tires, and urban dust all contribute. Indoor air can contain 1,000–60,000 microplastic fibers per cubic meter5.
  • Clothing — a single load of synthetic laundry releases up to 700,000 microplastic fibers into wastewater6.

What Happens Once They’re in the Blood?

The blood findings matter because blood is the body’s transport system. Once in circulation, microplastics can reach virtually any organ. Research published since the 2022 study has confirmed this:

  • Placenta — microplastics were found in human placental tissue on both the maternal and fetal sides, raising concerns about prenatal exposure7.
  • Lungs — a 2022 study found microplastics deep in 11 out of 13 human lung tissue samples from living patients8.
  • Heart — in 2023, researchers detected microplastics in human heart tissue for the first time, including samples taken during open-heart surgery9.

Studies suggest that once lodged in tissue, microplastics may trigger local inflammatory responses. The particles can carry chemical additives — plasticizers, flame retardants, heavy metals — that leach out slowly over time2. The long-term health effects are still being studied, but animal research has linked chronic microplastic exposure to gut inflammation, metabolic disruption, and reproductive harm.

This is preliminary but concerning evidence. We don’t yet have large-scale human outcome studies, so it’s too early to say definitively what microplastic accumulation does to human health over decades. But the direction of the evidence is consistent enough to take precaution seriously.

What You Can Do

You can’t eliminate microplastic exposure entirely — these particles are everywhere. But research points to specific, high-impact changes that meaningfully reduce your daily intake.

1. Stop Heating Food in Plastic

Heat dramatically accelerates plastic leaching. Microwaving food in plastic containers releases millions of microplastic particles per square centimeter. Switch to glass, ceramic, or stainless steel containers for heating and storing food. A ready-made set like the Pyrex glass meal prep containers makes the swap straightforward. This is the single easiest high-impact change.

2. Filter Your Drinking Water

Reverse osmosis (RO) filtration removes over 99% of microplastics from drinking water10. Standard carbon filters help but are less effective for the smallest particles. A countertop unit like the AquaTru Countertop RO System requires no plumbing install and fits most kitchens. If you’re on bottled water, switching to filtered tap water through an RO system both reduces microplastic intake and eliminates plastic bottle exposure.

3. Reduce Plastic Food Packaging

Where practical, choose products with glass, paper, or minimal packaging. Store leftovers in glass containers. Avoid single-use plastic wraps in direct contact with food — especially hot or fatty foods, which accelerate leaching. Reusable alternatives like Bee's Wrap beeswax food wraps work well for covering bowls, wrapping cheese, and bundling produce.

4. Address Clothing Fiber Shedding

Synthetic fabrics (polyester, nylon, acrylic) shed microplastic fibers every time you wash them. You can reduce this by:

  • Choosing natural fibers (cotton, wool, linen) when buying new clothes
  • Using a microfiber-catching laundry bag — studies show these capture up to 54% of released fibers6
  • Washing synthetic clothes less frequently and on lower temperatures

5. Improve Indoor Air Quality

Since airborne microplastics are a meaningful exposure route, regularly ventilating your home and using a HEPA air purifier can help. HEPA filters capture particles down to 0.3 microns — well within the microplastic range. A reliable mid-range option is the Coway Airmega AP-1512HH , which covers rooms up to 360 sq ft.

6. Swap Plastic Tea Bags and Kettles

If you drink tea, switch from plastic-mesh tea bags to loose leaf tea with a metal or ceramic infuser — a FORLIFE stainless steel tea infuser lasts for years. Plastic kettles also release microplastics into boiled water; a stainless steel kettle like the Cosori electric kettle eliminates this.

The Bigger Picture

The Leslie et al. study was a proof of concept with a small sample (22 people). Larger studies are needed to establish population-level exposure patterns and connect blood microplastic levels to health outcomes. But the finding has since been supported by organ-level detection studies across lungs, heart, and placenta.

The science is moving fast. What we know today: microplastics are in our blood, they accumulate in organs, and exposure is largely driven by everyday habits we can change. The precautionary steps above are low-cost, low-effort, and aligned with the evidence we have.

Frequently Asked Questions

Are microplastics in blood dangerous?
We don’t yet have large human outcome studies linking blood microplastic levels to specific diseases. Animal studies show inflammation, metabolic disruption, and reproductive harm from chronic exposure, and human tissue studies confirm accumulation in organs — so the precautionary case for reducing exposure is strong.
What's the most effective way to reduce microplastic exposure?
Research points to three high-leverage changes: stop heating food in plastic, filter drinking water with reverse osmosis, and switch to glass or stainless steel food storage.
Does bottled water contain more microplastics than tap water?
Yes. One study found an average of 325 particles per liter in bottled water — significantly more than typical tap water. Filtered tap water through a reverse osmosis system is the lowest-exposure option.

For a practical guide to reducing your total microplastic exposure — water, food packaging, and indoor air — see our environmental toxin reduction overview. For a practical guide to choosing a water filter, see our evidence-based water filtration guide.

This article is for informational purposes only and does not constitute medical advice.

  1. Leslie, H.A., van Velzen, M.J.M., Brandsma, S.H. et al. “Discovery and quantification of plastic particle pollution in human blood.” Environment International, Volume 163, 2022. https://doi.org/10.1016/j.envint.2022.107199 ↩︎

  2. Thompson, R.C., Moore, C.J., vom Saal, F.S. et al. “Plastics, the environment and human health: current consensus and future trends.” Philosophical Transactions of the Royal Society B, Volume 364, 2009. https://doi.org/10.1098/rstb.2009.0053 ↩︎ ↩︎

  3. Hernandez, L.M., Xu, E.G., Larsson, H.C.E. et al. “Plastic Teabags Release Billions of Microparticles and Nanoparticles into Tea.” Environmental Science & Technology, Volume 53, 2019. https://doi.org/10.1021/acs.est.9b02540 ↩︎

  4. Mason, S.A., Welch, V.G., Neratko, J. “Synthetic Polymer Contamination in Bottled Water.” Frontiers in Chemistry, Volume 6, 2018. https://doi.org/10.3389/fchem.2018.00407 ↩︎

  5. Dris, R., Gasperi, J., Mirande, C. et al. “A first overview of textile fibers, including microplastics, in indoor and outdoor environments.” Environmental Pollution, Volume 221, 2017. https://doi.org/10.1016/j.envpol.2016.12.013 ↩︎

  6. Napper, I.E., Thompson, R.C. “Release of synthetic microplastic plastic fibres from domestic washing machines: Effects of fabric type and washing conditions.” Marine Pollution Bulletin, Volume 112, 2016. https://doi.org/10.1016/j.marpolbul.2016.09.025 ↩︎ ↩︎

  7. Ragusa, A., Svelato, A., Santacroce, C. et al. “Plasticenta: First evidence of microplastics in human placenta.” Environment International, Volume 146, 2021. https://doi.org/10.1016/j.envint.2020.106274 ↩︎

  8. Jenner, L.C., Rotchell, J.M., Bennett, R.T. et al. “Detection of microplastics in human lung tissue using μFTIR spectroscopy.” Science of The Total Environment, Volume 831, 2022. https://doi.org/10.1016/j.scitotenv.2022.154907 ↩︎

  9. Yang, Y., Xie, E., Du, Z. et al. “Detection of Various Microplastics in Patients Undergoing Cardiac Surgery.” Environmental Science & Technology, Volume 57, 2023. https://doi.org/10.1021/acs.est.2c07179 ↩︎

  10. Enfrin, M., Dumée, L.F., Lee, J. “Nano/microplastics in water and wastewater treatment processes — Origin, impact and potential solutions.” Water Research, Volume 161, 2019. https://doi.org/10.1016/j.watres.2019.06.049 ↩︎