In 2015, the United States passed the Microbead-Free Waters Act, banning plastic microbeads in rinse-off cosmetics like exfoliating scrubs. The problem appeared solved. It wasn't. The law covered a narrow category of products while leaving the vast majority of microplastic-containing cosmetics — moisturizers, foundations, sunscreens, primers, lipsticks — completely untouched.
The result: microplastics in cosmetics didn't go away. They just moved to products you leave on your face for 8-12 hours at a time.
What Counts as a Microplastic in Cosmetics
Microplastics in cosmetics fall into two categories:
Solid microplastics — tiny plastic particles used for texture, exfoliation, or as fillers. These include polyethylene beads (the kind that was banned in scrubs), nylon-12 powder (used as a mattifying agent), and polymethyl methacrylate (PMMA) microspheres used in primers to "blur" pores.
Liquid and semi-liquid synthetic polymers — silicones, acrylates, and other petroleum-derived polymers used for slip, moisture-locking, film-forming, and emulsification. These include dimethicone (the most common silicone in skincare), cyclomethicone, acrylates copolymer, and PEG compounds. While they don't look like the plastic beads you might picture, they're synthetic polymers that don't biodegrade and accumulate in the environment identically to solid microplastics.
"The microbead ban addressed the visible problem — the scrub beads you could feel. The invisible problem — liquid polymers in every moisturizer, primer, and sunscreen — is orders of magnitude larger."
The Ingredient Label Cheat Sheet
Cosmetic ingredient lists are deliberately opaque. Here are the most common microplastic and synthetic polymer ingredients to watch for:
| Ingredient | What It Does | Found In |
|---|---|---|
| Polyethylene (PE) | Exfoliant beads, binding agent | Scrubs, lip products |
| Nylon-12 | Mattifying powder, bulking agent | Foundation, pressed powder |
| Polymethyl methacrylate (PMMA) | Pore-blurring microspheres | Primers, foundations |
| Polytetrafluoroethylene (PTFE) | Texture enhancer (Teflon) | Pressed powder, blush |
| Dimethicone | Slip, moisture barrier | Moisturizers, primers, shampoo |
| Cyclomethicone | Evaporative carrier, smooth feel | Serums, leave-in conditioner |
| Acrylates copolymer | Film-forming, hold | Sunscreen, mascara, nail polish |
| Acrylates crosspolymer | Thickener, stabilizer | Gel moisturizers, sunscreen |
| PET (Polyethylene terephthalate) | Glitter, shimmer particles | Eyeshadow, body shimmer |
Quick rule of thumb: any ingredient starting with "poly-" or ending in "-cone" is a synthetic polymer worth questioning.
Which Products Are Worst?
Not all cosmetics carry equal risk. Leave-on products that stay on your skin for hours are a fundamentally different exposure than rinse-off products that contact your skin for 60 seconds. Here's the priority order for swapping:
1. Sunscreen — the biggest daily offender
Conventional sunscreens are among the most polymer-dense cosmetic products. They use acrylates for film-forming (to make the sunscreen water-resistant), silicones for spreadability, and often contain PMMA or nylon-12 for texture. You apply sunscreen to large skin areas, reapply throughout the day, and leave it on for hours. If you're going to swap one product first, make it this one.
2. Moisturizer — twice daily, every day
Most drugstore moisturizers use dimethicone or cyclomethicone as the primary "moisture-locking" ingredient. The silicone creates a synthetic film over your skin that prevents water loss — effective, but it's a plastic film. Applied twice daily, 365 days a year, this is your highest-frequency exposure.
3. Foundation and primer
Primers use PMMA microspheres and silicones to create a "smooth canvas." Foundations layer additional polymers on top. Together, they form multiple synthetic films on your face for 8-14 hours.
4. Lip products
Lipstick, lip gloss, and lip balm are unique because they're ingested — the average person who wears lipstick consumes an estimated 1.8 kg of lip product in their lifetime. Many lip products contain PET glitter, synthetic waxes, and acrylates.
Cleaner Alternatives That Actually Work
Switch Mineral sunscreen (replaces chemical/polymer sunscreen)
Switch Plant-oil moisturizer (replaces silicone-based moisturizer)
Switch Clean foundation and primer
Switch Clean lip products
How to Check Any Product in 30 Seconds
You don't need to memorize every synthetic polymer. Two tools make this simple:
- Beat the Microbead app (by the Plastic Soup Foundation) — scan any product barcode. Red/orange/green rating. Free. Available for iOS and Android.
- EWG Skin Deep database (ewg.org/skindeep) — search by product name. Rates every ingredient for toxicity and environmental concern. Look for "EWG Verified" products for the cleanest options.
- INCI Decoder (incidecoder.com) — paste any ingredient list and get a plain-English breakdown of every component, including whether it's a synthetic polymer.
"Natural," "clean," and "green" are unregulated marketing terms in cosmetics. A product can be labeled "natural" and still contain dimethicone, acrylates, and synthetic fragrance. Only third-party certifications (COSMOS, EWG Verified, USDA Organic, Ecocert, NATRUE) have enforceable ingredient restrictions. When in doubt, read the ingredient list — not the front label.
The Priority Swap Order
If you're switching gradually, here's the order that reduces the most microplastic exposure per swap:
- Sunscreen — largest skin area, longest wear time, reapplied throughout the day. Switch to mineral zinc oxide sunscreen. ($16-20)
- Moisturizer — used twice daily, every day, year-round. Switch to plant-oil or beeswax-based. ($12-44)
- Lip products — only category you directly ingest. Switch to organic beeswax balm. ($4-32)
- Foundation/primer — full-face coverage for hours. Switch to mineral or oil-based. ($36-48)
- Shampoo and conditioner — rinse-off (lower concern) but daily frequency adds up. Switch to silicone-free. Many drugstore options now available.
Total cost to replace all five categories with clean alternatives: roughly $80-160 — comparable to what most people already spend on conventional products.
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Frequently Asked Questions
Yes. A 2021 study by the Plastic Soup Foundation analyzed over 7,700 cosmetic products across major brands and found that 87% contained microplastics or synthetic polymers. These include polyethylene microbeads, nylon-12, polymethyl methacrylate, and liquid polymers like dimethicone and cyclomethicone. While the US Microbead-Free Waters Act of 2015 banned plastic microbeads in rinse-off products like scrubs, it did not cover leave-on products like moisturizers, foundations, sunscreens, or lipsticks — which is where most microplastic exposure now occurs.
Research suggests that nanoparticles (plastics smaller than 1 micrometer) may penetrate the outer skin barrier, particularly through damaged or inflamed skin. A 2020 study in Environment International found nanoplastic particles capable of crossing cell membranes in vitro. Larger microplastic particles (1-5mm) are less likely to penetrate intact skin but can enter through hair follicles, pores, or micro-abrasions. The concern intensifies with products designed to be left on the skin for extended periods.
Look for these ingredients: Polyethylene (PE), Polypropylene (PP), Polymethyl methacrylate (PMMA), Nylon-12, Nylon-6, Polyethylene terephthalate (PET), Polytetrafluoroethylene (PTFE), Acrylates copolymer, and Acrylates crosspolymer. Silicones like dimethicone, cyclomethicone, and cyclopentasiloxane are synthetic polymers that behave similarly. The Beat the Microbead app lets you scan barcodes to check instantly.
Dimethicone is a silicone-based polymer — technically not a microplastic in the traditional sense, but it is a synthetic polymer derived from petroleum processing. It does not biodegrade and accumulates in waterways. The ECHA proposed restrictions on intentionally added microplastics in 2019 that include certain silicones. Many clean beauty certifications restrict or prohibit dimethicone.
Not always. "Natural" and "organic" are loosely regulated in cosmetics. A product labeled "natural" can still contain synthetic polymers. Look for third-party certifications: COSMOS Organic/Natural, EWG Verified, USDA Organic, or Ecocert. These have explicit restrictions on synthetic polymers.
The products with the highest microplastic content are: (1) Sunscreens — often contain PMMA, silicones, and film-forming polymers. (2) Foundations and primers — use silicones and acrylates for smooth application. (3) Lip products — glitter, shine agents, and film formers are frequently plastic-based. (4) Exfoliating scrubs — some still use polyethylene or nylon particles. (5) Mascara and eyeliners — nylon fibers and film-forming polymers. Leave-on products are a greater concern than rinse-off.
Sources
- Plastic Soup Foundation. "Beat the Microbead: Product Analysis Report." 2021.
- Hernandez LM, et al. "Plastic Teabags Release Billions of Microparticles and Nanoparticles into Tea." Environmental Science & Technology, 2019.
- Yee MS, et al. "Impact of Microplastics and Nanoplastics on Human Health." Nanomaterials, 2021.
- Hwang J, et al. "An assessment of the toxicity of polypropylene microplastics in human derived cells." Science of the Total Environment, 2019.
- Campanale C, et al. "A Detailed Review Study on Potential Effects of Microplastics and Additives of Concern on Human Health." International Journal of Environmental Research and Public Health, 2020.
- European Chemicals Agency (ECHA). "Restriction proposal on intentionally added microplastics." 2019.
- US Congress. "Microbead-Free Waters Act of 2015." Public Law 114-114.
- Leslie HA, et al. "Discovery and quantification of plastic particle pollution in human blood." Environment International, 2022.
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