Microplastics in the Body: What Science Really Says

For years, we thought of plastic pollution as a problem of beaches, sea turtles, and floating bottles. In recent years, science has discovered something much more personal: those tiny plastic particles don't stay in the ocean; they are inside us. Microplastics have been detected in human blood, the placenta, lung tissue, and most recently, most alarmingly, inside atherosclerotic plaque in the carotid arteries of patients. The latest headline came in 2024 from one of the world's most prestigious journals, the New England Journal of Medicine, and changed the entire conversation.

And here is exactly where the problem begins. As soon as something is alarming enough to make headlines, products promising to "flush the plastic out of your body," expensive "detox" protocols, and supplements with an aura of a magic solution immediately appear. We are not here for that. In this guide, we will do something different: we will show what the science really shows, honestly, including what is still unknown, and most importantly, separate what works from what is sold. Let's start with the bottom line so there is no misunderstanding: There is currently no supplement proven to remove plastic particles already embedded in body tissues. The only move with high scientific confidence is to reduce exposure in the first place. Everything else ranges from "modest help" to "marketing."

What are Microplastics and Nanoplastics, and Where Do They Come From?

Microplastic is a general term for plastic particles smaller than 5 millimeters. The smaller the particles, the more dangerous they are, because they can penetrate deeper into the body. The particularly tiny particles, under one micron, are called nanoplastics, and they are small enough to pass through cell walls and possibly even cross the blood-brain barrier.

• Primary Microplastics: Made small from the start, for example, plastic microbeads in cosmetics (exfoliants) or synthetic fibers released from clothing during washing.
• Secondary Microplastics: Formed from the breakdown of larger plastic items, bottles, packaging, and bags, which disintegrate over time into smaller and smaller particles.
• Our Main Sources: Drinking water (including bottled water), packaged food, seafood, sea salt, and also household dust, which is a real and often underestimated source of exposure through inhalation.
• Heating in Plastic: Heating food or hot liquids in plastic containers significantly increases the release of particles and chemicals, and this is one of the factors easiest to control.

Are Microplastics Really Inside Us?

Here the answer is unequivocal: Yes. This is no longer a hypothesis; it is a well-documented reality.

The first turning point came in 2022, when a team from the University of Amsterdam led by Heather Leslie published in Environment International the first identification of plastic particles in human blood. They tested blood from 22 healthy adults and found plastic particles in about 80% of them, at an average concentration of about 1.6 micrograms of plastic per milliliter of blood. Since then, plastic particles have also been detected in the placenta of pregnant women, in various tissues, and even in seminal fluid and breast milk.

But the important point is not just "that they are there," but what they are doing there. And here we need to stop and be honest: Presence is not proof of widespread harm. The fact that particles were found in blood does not automatically mean that every person with plastic in their blood will get sick. Much of the data on harm still comes from observational studies (which show a correlation, not necessarily causation) or from cell and animal models. This doesn't mean there is no cause for concern, but that we need to read the evidence with a sober eye, not a hysterical one.

What is the Real Harm? Between Evidence-Based Concern and Uncertainty

Three leading mechanisms explain why microplastics might be harmful, alongside the cardiovascular study that made everyone worried.

Mechanism 1: Endocrine Disruptors

The plastic itself is only part of the story. The particles carry on their surface and within them additive chemicals like BPA (Bisphenol A) and phthalates, which are known endocrine disruptors. That is, they can mimic or interfere with hormones in the body, raising concerns about fertility, development, and metabolism. This is one of the more established concerns, because there are years of separate research on these chemicals.

Mechanism 2: Inflammation and Oxidative Stress

When foreign particles enter tissue, the immune system reacts. In cell and animal models, plastic particles trigger low-grade chronic inflammation and oxidative stress, meaning an overproduction of free radicals that damage cells, DNA, and mitochondria. Chronic inflammation and oxidative stress are precisely the two mechanisms at the heart of the aging process itself, making this topic particularly relevant to longevity.

Mechanism 3: The Cardiovascular Signal, the Study That Changed Everything

In 2024, Raffaele Marfella and colleagues published a groundbreaking observational study in the New England Journal of Medicine. They examined atherosclerotic plaque tissue removed from the carotid arteries of 257 patients and found microplastics and nanoplastics (mainly polyethylene and PVC) in about 58% of the plaques. The alarming part: In patients where plastic was found in the plaque, the risk of heart attack, stroke, or death from any cause during a follow-up of about 34 months was about 4.5 times higher (hazard ratio 4.53) compared to patients whose plaque did not contain plastic.

This is the most significant finding to date directly linking microplastics in the body to serious health outcomes. But, and this is an important asterisk, this is an observational study: it shows a strong correlation, not proof of causation. It is possible that the plastic directly contributes to the damage, and it is possible that it is a marker of lifestyle or other environmental exposure. The researchers themselves call for follow-up studies. This is exactly the point: the evidence is serious enough to justify reducing exposure, but not unequivocal enough to justify panic or expensive "detox treatments."

How to Actually Reduce Exposure? (The Core with the Highest Confidence)

If there is one thing to take away from this guide, it is this part. Unlike all the "detoxes," reducing exposure is the only move with strong scientific support, simply because it prevents the plastic from entering in the first place. Here is a practical list, from most impactful downwards:

• Don't heat food and drink in plastic: Not in the microwave in plastic containers, and not hot liquids in plastic cups. Heat releases particles and chemicals. This is perhaps the single most important step.
• Prefer glass and stainless steel: For food storage, water bottles, and cups. Especially for hot, fatty, or acidic food.
• Filter your tap water: A good home water filter reduces the number of particles. At the same time, reduce bottled water, which has been found to contain hundreds of times more particles than tap water.
• Reduce canned and ultra-processed food: The inner lining of cans often contains BPA, and plastic packaging of processed food is a direct source of exposure.
• Choose loose-leaf tea over plastic tea bags: Some tea bags release billions of particles into the hot water.
• Ventilate and clean dust: Household dust is a real source of exposure through inhalation. Ventilation, dusting, and using a vacuum with a filter help.
• Wash and choose natural fabrics: Synthetic clothing (polyester, nylon) releases fibers. Cotton, linen, and wool reduce the problem.

An honest point to conclude: You cannot reach zero, and that's okay. Microplastics are everywhere in the environment, and the goal is not to achieve a sterile, plastic-free life (that's impossible and stressful), but to reasonably reduce daily exposure in places where it's easy.

What Does Research Say About "Cleaning" and Reducing Microplastics from the Body?

And here we arrive at the part everyone is looking for, and around which the most marketing is built. Let's be clear about the mechanism before we get to the list: the interventions that have a research basis do not "dissolve" or "flush out" plastic already embedded in arteries or the brain. What they do, at best, is one of two things: reduce absorption and accelerate excretion of new particles that are ingested (fiber, probiotics), or mitigate the oxidative damage caused by the plastic (antioxidants). This is a huge difference from "detox." Here is the honest ranking:

• 🟡 Dietary Fiber: This is the intervention with the best mechanistic logic. A review by Wang et al. in Food Frontiers (2024) explains how fiber can bind plastic particles in the gut and accelerate their excretion in feces, thus reducing absorption. A 2025 rat study (Scientific Reports) showed that the fiber chitosan increased the rate of microplastic excretion and reduced its amount in the gut within days. Important: The evidence is mainly mechanistic and from animals, and it concerns new particles passing through the gut, not plastic already in the blood. Nevertheless, fiber is an excellent health recommendation anyway, for many other reasons.
• 🟡 Probiotics: Several studies in Frontiers in Microbiology (2024) identified that certain strains of gut bacteria, such as Lactiplantibacillus plantarum and Lacticaseibacillus paracasei, adhere to plastic particles and reduce their adhesion to gut tissue and inflammation. A broad review of 784 strains found that selected strains increased polystyrene excretion in mice by about 34% and reduced particle residues in the gut by about 67%. Again, all data are from animals and in vitro, not humans.
• 🟡 Antioxidants (NAC, Vitamin C, Vitamin E): A review in the journal Antioxidants (2025) concludes that certain antioxidants reduce the oxidative and inflammatory damage caused by microplastics in cells and animals. Note the words: they mitigate the damage, they do not remove the particles. This is a legitimate mechanism for support, but not "cleaning."
• 🔴 Chlorella: Here there is a common deception that needs to be called out. There is indeed a study (Heliyon, 2023) showing that the algae chlorella effectively removes polyethylene, but it deals with removing plastic from water in an industrial water purification process, not from the human body. Marketing takes this result and presents it as if chlorella "cleans the body of plastic," which is a scientific leap with no basis. Don't fall for it.
• 🟡 Sweating and Sauna: "Blood-urine-sweat" studies by Genuis (2011-2012) showed that plastic chemicals, BPA and phthalates, are indeed excreted in sweat. But two crucial caveats: First, these are chemicals, not the plastic particles themselves. Second, an analysis from the University of Ottawa found that sweat carries only a "fraction of a percent" of the daily intake. That is, minor at best, and certainly not "removing microplastics." If you enjoy a sauna for other reasons, great, just don't expect it to clean out your plastic.
• 🟡 Therapeutic Apheresis (Blood Filtration): This is perhaps the first human evidence. A study by Bornstein et al. in Brain Medicine (2025) on 21 patients with chronic fatigue syndrome and long-COVID found that extracorporeal blood filtration successfully physically removed microplastic-like particles from the blood. But: This is an invasive medical procedure (not a supplement), the sample is tiny, and the study did not measure levels before and after in the body, but analyzed what was caught in the filter. The researchers themselves clearly call for larger studies. A promising direction, very far from an established treatment.

The Honest Bottom Line

So what do you actually do? Here is the summary without embellishments:

1. No supplement is proven to remove plastic already embedded in tissues. Anyone selling you "microplastic detox" is selling hope, not science.
2. Reducing exposure is the most powerful and proven lever. Don't heat in plastic, prefer glass and stainless steel, filter water, and reduce packaged food. This is where most of the benefit lies.
3. Support your natural detoxification organs. The body is already equipped with a sophisticated filtration system: the liver, kidneys, and gut. A diet rich in fiber, adequate hydration, and maintaining metabolic health help them work. If you want to understand how supplements can support natural detoxification organs (without magic promises), you can see Supplement Matching, Natural Detox and Filtration, and for reading on liver support, there are the guides.
4. Fiber and antioxidants are reasonable support, not magic. They are healthy anyway and have mechanistic logic here, but don't treat them as "plastic cleaners." For a deeper dive into a fiber-rich diet, you can read Nutrition for Longevity.
5. Don't live in fear. Microplastics are a real problem worth reducing, but chronic stress about the issue itself is more harmful to health than an extra glass of water from a bottle once a week. Reasonable control, not obsession.

Summary and Practical Checklist

Microplastics are already inside us, and this is well-established. The evidence for harm, led by the 2024 NEJM study linking them to cardiovascular risk, is serious enough to warrant sober action, but not unequivocal enough to justify panic or magic treatments. The difference between a healthy approach and a marketing trap is simple: Instead of trying to flush out plastic already embedded, prevent it from entering in the first place. Here is the checklist:

• Don't heat food and drink in plastic.
• Glass and stainless steel instead of plastic, especially for hot food.
• Filter tap water, reduce bottled water.
• Less canned and ultra-processed food.
• Loose-leaf tea instead of plastic tea bags.
• Ventilate and clean dust at home.
• A diet rich in fiber, to support the natural excretory system.
• Support the liver, kidneys, and gut, the body's real detoxification organs.

In the end, the most important message is not about plastic at all, but about how to read science: when something alarming makes headlines, magic solutions immediately appear. The real power is knowing how to distinguish between what is proven and what is sold. With microplastics, what is proven is to reduce exposure and support the body, not to flush it out.

The information in this article is general and for informational and lifestyle purposes only, and does not constitute medical advice or a substitute for consultation with a physician. Do not start any "detox" protocol, apheresis treatment, or take any supplements based on this article without consulting a medical professional, especially if you are pregnant, have a chronic illness, or are taking medications.

References:
Marfella R et al., New England Journal of Medicine 2024, Microplastics and Nanoplastics in Atheromas and Cardiovascular Events
Leslie HA et al., Environment International 2022, Discovery and quantification of plastic particle pollution in human blood
Wang Y et al., Food Frontiers 2024, Fighting microplastics: The role of dietary fibers in protecting health
Teng X et al., Frontiers in Microbiology 2024, Novel probiotics adsorbing and excreting microplastics in vivo
Antioxidants 2025, Antioxidant Intervention Against Microplastic Hazards
Bornstein SR et al., Brain Medicine 2025, Therapeutic apheresis: A promising method to remove microplastics?