Microplastics FAQ

Plastic particles smaller than 5 millimeters. Particles under 1 micrometer are called nanoplastics. They are either made small on purpose (microbeads, glitter) or break off larger plastic items through heat, wear and washing.

Possibly, but it is not proven. Lab and animal studies show inflammation and cell stress, and a 2024 human study linked plastic in artery plaque to more heart attacks and strokes. Human studies so far show associations, not cause, and some findings are disputed.

Mostly by swallowing them in food and drink and by breathing them in from indoor air and dust. Skin absorption appears to be minor.

Probably some, but the amount is uncertain. A 2025 study claiming a spoon's worth was challenged for mistaking brain fats for plastic. A 2026 study of 191 samples found about one hundredth of that amount, and it is also being debated.

A 2024 study of three US brands found about 240,000 plastic particles per liter on average, roughly 90% of them nanoplastics. Tap water typically contains far fewer.

Partly. Boiling hard tap water for five minutes and pouring it through a coffee filter removed up to 90% of added particles in one lab study, and about 25% in soft water. Use a steel or glass kettle.

Reverse osmosis systems remove the most. Otherwise choose a filter whose official listing shows a microplastics reduction claim under NSF/ANSI 401, which requires at least 85% reduction of 0.5 to 1 micrometer particles.

Some do. Silky nylon or PET tea bags released billions of particles per cup in a 2019 study, and many paper bags contain polypropylene seals. Loose-leaf tea avoids the problem.

It is best avoided. Microwaving plastic containers released billions of nanoplastics per square centimeter in a 2023 study. Microwave-safe only means the container will not melt.

Yes. One study estimated tens of millions of particles a year per person from chopping on polyethylene or polypropylene boards. Wood or bamboo boards are a good alternative.

Polypropylene baby bottles released 1.3 to 16.2 million particles per liter when used with hot water in a 2020 study. Preparing formula in glass and cooling it before filling the bottle reduces this greatly.

Yes. Polyester, nylon and acrylic shed fibers when worn and washed. Synthetic textiles are estimated to be the largest single source of primary microplastics reaching the oceans.

Plastic microbeads in rinse-off cosmetics and toothpaste are banned in the US under the Microbead-Free Waters Act of 2015, and in the EU, UK and Canada. The EU is also phasing out other intentionally added microplastics through 2035.

Shellfish eaten whole, such as mussels and oysters, tend to contain more because you eat their digestive tract. Fish fillets contain fewer. Seafood's nutritional benefits are well established, so variety is a better approach than avoidance.

Not reliably as a consumer. Measuring plastic in blood or tissue requires specialized labs, and methods are still being standardized. Commercial tests should be treated with caution.

There is no proven method. Supplements, detoxes and blood-filtering services marketed for this have no good evidence. Reducing new exposure is the practical step.

Not directly yet, apart from the microbead ban. In April 2026 the EPA proposed listing microplastics as a priority contaminant group for drinking water, and HHS launched a $144 million research program.

Stop heating food and drinks in plastic. Then switch from bottled to tap water, use loose-leaf tea, and boil water in a steel or glass kettle.