Microplastics, sorted by what you can actually do about them.
Microplastics are plastic particles smaller than 5 millimeters. They have been found in bottled water, food, indoor air and human tissue. This guide explains what the science shows, labels how strong each finding is, and lists the everyday swaps that cut your exposure most.
How small is a microplastic?
The size range runs from about a sesame seed down to smaller than a virus. Smaller particles are harder to measure and are the ones scientists worry most about, because they can cross into cells.
Log scale: each tick is ten times smaller than the one before. Certified water filters are tested on particles of 0.5 to 1 µm. Read more in What are microplastics?
Where microplastics are in your life
Pick the part of your day you want to check. Each page lists the specific items, how much they shed, and a better option.
Bottled vs. tap water
Bottled water averaged about 240,000 particles per liter in one 2024 study. What filters actually remove them.
KitchenFood, containers & cookware
Microwaved containers, tea bags, cutting boards, seafood and salt. Heat is the biggest factor.
TextilesClothing & laundry
Synthetic fabrics shed fibers into air and wastewater. Filters can catch most of them.
BabiesBaby bottles & kids
Plastic bottles can release millions of particles per liter when used with hot water. A safer prep method.
BathroomCosmetics & personal care
Microbeads, glitter and polymer ingredients, plus the ingredient names to look for on labels.
Full listAll everyday sources
A room-by-room list of products that contain or shed microplastics, ranked by how much they matter.
What the science says, rated
Microplastics research moves fast and some headline numbers have not held up. Every claim on this site carries one of three labels.
Microplastics are in drinking water, food, air and dust worldwide, and heating plastic increases how many particles it releases.
Plastic particles found in artery plaque were linked to a higher rate of heart attack, stroke and death in a 2024 study of about 250 patients. This is an association, not proof of cause.
Lab and animal studies show inflammation, oxidative stress and gut changes, but often at doses far higher than people are exposed to.
Claims that the human brain holds "a spoon's worth" of plastic, or that people eat "a credit card a week", rely on methods other scientists have challenged.
Five swaps with the biggest payoff
Ranked by how much exposure they remove for the effort involved.
- Microwaving in plastic containers→Heat in glass or ceramic
- Bottled water→Tap water through an NSF/ANSI 401 certified filter
- Nylon or PET "silky" tea bags→Loose-leaf tea in a steel infuser
- Plastic cutting board→Hardwood or bamboo board
- Dry dusting and sweeping→Damp cloth and a HEPA vacuum
Latest articles
New studies and rules, explained the day they matter.
- EPA Puts Microplastics on Its Drinking Water Watch List: What It Means for Your Tap
In 2026 the EPA proposed adding microplastics to its drinking water Contaminant Candidate List for the first time. What that does, what it does not do, and what you can do now.
- Is There Really a Spoon of Plastic in Your Brain? What the 2025–2026 Studies Show
The viral "spoonful of plastic in the brain" claim, the scientists who challenged it, and the larger 2026 study that found about a hundredth as much. What we actually know.
Frequently asked questions
Are microplastics harmful to humans?
Nobody can say for sure yet. Lab and animal studies link micro- and nanoplastics to inflammation and oxidative stress, and one 2024 human study linked plastic particles in artery plaque to more heart attacks and strokes. But human studies show associations, not proof of cause, and some high-profile measurements are disputed. Health agencies such as the WHO say reducing exposure is a sensible precaution.
What are the biggest everyday sources of microplastics?
For most people the largest controllable sources are heated plastic food containers, plastic tea bags, bottled water, plastic cutting boards, indoor dust from synthetic textiles, and polypropylene baby bottles used with hot water.
What is the single most useful change I can make?
Stop heating food or drinks in plastic. Heat sharply increases how many particles plastic releases, so moving hot food and drinks to glass, ceramic or stainless steel removes one of the largest sources with little cost.