Microplastics in Your Products: From Exfoliants to Tea Bags

In March 2022, researchers at Vrije Universiteit Amsterdam published a study in Environment International that changed the conversation about plastic pollution. For the first time, microplastics were detected in human blood. PET (polyethylene terephthalate), polystyrene, and polyethylene --- the same plastics found in bottles, food packaging, and cosmetics --- were circulating inside living people.

The finding was not entirely surprising. Microplastics had already been documented in seafood, drinking water, and air. But blood was different. Blood meant these particles were not just passing through. They were being absorbed, transported, and deposited in tissues.

The question shifted from “are we exposed?” to “how much, and from where?”

Microbeads: The Problem We (Mostly) Solved

The first microplastic to draw public attention was also the most obvious one: the polyethylene microbead. Tiny plastic spheres, typically between 10 and 500 micrometers in diameter, were intentionally added to face scrubs, body washes, and toothpastes as exfoliating agents throughout the 2000s and early 2010s. A single tube of facial scrub could contain over 300,000 of them.

These beads were too small for wastewater treatment plants to filter out. They flowed directly into rivers, lakes, and oceans, where they accumulated in sediment and were ingested by marine life. A 2015 study estimated that 8 trillion microbeads entered US waterways every day.

The backlash was swift. The United States passed the Microbead-Free Waters Act in 2015, banning plastic microbeads in rinse-off cosmetics. The United Kingdom followed with its own ban in 2018. The European Union implemented a broader restriction in 2023 under the REACH regulation, covering intentionally added microplastics in cosmetics, detergents, and agricultural products.

Microbeads were, in many ways, the easy target. They were intentionally added, clearly identifiable, and easily replaced with natural alternatives like ground walnut shell, pumice, or jojoba beads. Most rinse-off products on the market today are microbead-free.

But microbeads were only one source of microplastics in consumer products. And not even the largest one.

Where Microplastics Still Hide in Cosmetics

When regulators banned microbeads, they defined them narrowly: solid, unsoluble plastic particles under 5mm used for exfoliation or cleansing. This definition left out an entire class of synthetic polymers that remain common in cosmetics today.

Leave-on products --- moisturizers, foundations, sunscreens, hair styling products --- frequently contain synthetic polymers that function as film-formers, texture enhancers, emulsifiers, or viscosity controllers. These include:

Acrylates copolymer and acrylates crosspolymer --- film-forming agents in hairsprays, sunscreens, and makeup
Carbomer --- a thickening agent found in gels, creams, and lotions
Nylon-12 --- used for texture and oil absorption in powders and foundations
Polyquaternium compounds --- conditioning agents in shampoos and hair products
Polyethylene (non-bead forms) --- still used in some lip products and mascaras

These are not “microbeads” under most legal definitions, so they bypass microbead bans entirely. Whether they pose the same environmental and health concerns as microbeads depends on their form, solubility, and degradation profile --- questions that regulators are still working through.

The European Chemicals Agency (ECHA) proposed a broader restriction on intentionally added microplastics in 2019, which the European Commission adopted in phases starting in 2023. This restriction goes beyond microbeads to cover synthetic polymer microparticles in cosmetics, with transition periods extending to 2035 for certain product types.

Then there is glitter. Conventional glitter is a microplastic --- tiny pieces of metallized plastic film, usually PET or PVC. It washes off skin and clothing, enters waterways, and persists in the environment for centuries. The “biodegradable glitter” marketed as an alternative often uses modified cellulose with a plastic coating, and independent testing has shown that many of these products do not degrade meaningfully in natural environments. A 2020 study in the Journal of Hazardous Materials found that some biodegradable glitters were just as harmful to aquatic ecosystems as conventional versions.

Tea Bags, Packaging, and Food Contact

Cosmetics are not the only source. Some of the most significant microplastic exposures come from food contact materials --- the packaging, containers, and utensils that touch what we eat and drink.

In 2019, researchers at McGill University in Montreal published a study that caught widespread attention. They found that a single plastic mesh tea bag, steeped at brewing temperature (95 degrees Celsius), released approximately 11.6 billion microplastic particles and 3.1 billion nanoplastic particles into a single cup of tea. The particles were nylon and PET, the same polymers used to make the bags feel silky and see-through.

The numbers were staggering --- orders of magnitude higher than previously documented food-related microplastic exposures. Paper tea bags and loose-leaf tea do not have this problem.

Other food contact sources are less dramatic individually but add up through daily repetition:

Plastic cutting boards shed microplastic particles with every cut. A 2023 study in Environmental Science & Technology estimated that normal use of a polypropylene cutting board could generate tens of millions of microparticles annually.
Plastic food containers leach more microplastics when heated. Microwaving food in plastic containers, even those labeled “microwave safe,” increases particle release significantly. The “microwave safe” label means the container will not warp or melt --- it does not address microplastic migration.
Canned food linings present a related concern. After BPA (bisphenol A) was phased out of many can linings due to endocrine disruption concerns, some manufacturers switched to coatings containing bisphenol S (BPS) or other bisphenol analogues. Early research suggests BPS may have similar hormonal activity to BPA, raising questions about whether the replacement solved the problem or merely renamed it.

What Do Microplastics Do Inside Us?

Honestly, we do not fully know yet. And that uncertainty itself is part of the story.

Microplastics have now been detected in human blood (Vrije Universiteit Amsterdam, 2022), placentas (a 2020 study in Environment International found microplastic particles in four out of six human placentas examined), and lung tissue (a 2022 study in Science of the Total Environment identified microplastics in 11 of 13 lung tissue samples from living patients).

The particles are there. The question is what they do once inside.

Laboratory and animal studies have shown several potential mechanisms of harm:

Inflammation: Microplastic particles can trigger inflammatory responses in cells and tissues, particularly in the gut and lungs.
Oxidative stress: Exposure to certain microplastic types has been associated with increased production of reactive oxygen species, which can damage cells over time.
Endocrine disruption: Many plastics contain additives --- phthalates, bisphenols, flame retardants --- that are known or suspected endocrine disruptors. Microplastic particles can carry these chemicals into the body and release them gradually.
Carrier effect: Microplastics can absorb persistent organic pollutants from their environment and transport them into biological systems, potentially concentrating toxins.

However, most of this evidence comes from in vitro (cell culture) and animal studies, often at concentrations higher than what humans typically encounter. Large-scale human health impact studies are still in early stages. We do not yet have definitive evidence that the levels of microplastics currently found in human tissue cause specific diseases.

That said, the precautionary concern is legitimate. When a novel material is found circulating in human blood and embedded in lung tissue, waiting for decades of epidemiological data before taking any action is not the only reasonable response. Reducing unnecessary exposure where practical alternatives exist is a sensible approach --- even before the science is fully settled.

What You Can Actually Control

You cannot eliminate microplastic exposure entirely. Synthetic fibers from clothing, tire wear particles, and atmospheric deposition mean that some level of exposure is effectively unavoidable in modern life. But you can reduce the controllable sources:

In cosmetics and personal care:

Check ingredient lists for polyethylene --- if it appears in a rinse-off product, it may still contain microbeads (though this is increasingly rare in regulated markets)
Be aware of synthetic polymers like acrylates copolymer, nylon-12, and polyquaternium in leave-on products. These are not banned and may not pose the same risks, but alternatives exist if you prefer to avoid them
Use the Beat the Microbead app or look for the Zero Plastic Inside certification from the Plastic Soup Foundation to identify microplastic-free cosmetics
Treat conventional glitter as the microplastic it is

In food and drink:

Choose paper tea bags or loose-leaf tea over nylon or PET mesh bags
Do not microwave food in plastic containers --- transfer to glass or ceramic first
Replace heavily scored plastic cutting boards, or switch to wood or bamboo
When possible, store food in glass, stainless steel, or silicone rather than plastic

General:

Filter your drinking water. Many countertop and pitcher filters reduce microplastic particle counts, though effectiveness varies by filter type and particle size
Wash synthetic clothing in a microfiber-catching laundry bag to reduce fiber shedding into waterways

None of these steps require dramatic lifestyle changes. They are incremental adjustments that reduce exposure from the sources you have the most control over.

Looking Forward

Microplastic research is moving fast. Regulatory frameworks are expanding beyond the narrow microbead bans of the mid-2010s toward broader restrictions on intentionally added synthetic polymer particles. Analytical methods are improving, allowing detection of smaller particles and more accurate quantification of human exposure. And long-term health studies are underway that should, within the next decade, provide clearer answers about what chronic low-level exposure actually means for human health.

In the meantime, awareness is the first practical tool. Knowing which products contain synthetic polymers --- and which do not --- makes informed choices possible.

GradeMyLabel flags synthetic polymers like polyethylene, acrylates copolymer, nylon-12, and polyquaternium compounds in cosmetic and personal care ingredient lists, so you can see exactly what is in a product before you decide whether to use it.