Microplastics in Skincare: What's Actually in the Bottle

In 2022, researchers at Vrije Universiteit Amsterdam found microplastics in 80% of human blood samples tested. A year later, the same lab found them in placental tissue. We don't yet know what they do inside us. We do know how they got there.

What counts as a microplastic

The technical definition is a plastic particle smaller than 5mm. In cosmetics, the most common types are:

• Polyethylene (PE) — exfoliating beads in scrubs and toothpaste
• Polypropylene (PP) — film-formers in makeup
• Polymethyl methacrylate (PMMA) — "blurring" particles in primers
• Nylon-12 — silky-feel additives in foundations
• Acrylates copolymer — long-wear binders in mascaras and lip products

Read the back of a "long-lasting" foundation or a "shine-control" primer. You'll usually find at least one of these in the first ten ingredients.

The "ban" that isn't really a ban

The US Microbead-Free Waters Act (2015) banned rinse-off microbeads. The EU's ECHA restriction (2023) goes further but phases in over eight years. Neither covers leave-on cosmetics. Neither covers liquid plastics (acrylates copolymer is still legal everywhere).

So when a brand says "microbead free," they're telling you about one specific molecule. The rest of the plastic in the bottle is unaffected.

How they get out of the bottle

Three pathways:

1. Wash-off. You rinse them down the drain. Wastewater treatment catches some, but particles below 20 microns slip through.
2. Wear-off. Foundation and mascara flake off through the day. The dust ends up in household air, then vacuumed up and landfilled.
3. Packaging shed. Plastic packaging itself sheds microplastic as it degrades. A study in *Environmental Science & Technology* found measurable shedding from tubes within 12 months of manufacture.

What to look for on a label

Quick scan: any ingredient ending in -ene, -acrylate, -acrylates copolymer, or -polymer that isn't obviously plant-derived is probably synthetic plastic. The Beat the Microbead app (free, run by the Plastic Soup Foundation) lets you scan and check.

Lower-impact alternatives

Most "feel" effects from microplastics can be replicated with:

• Cellulose for blur and softness
• Silica (from sand) for oil control
• Mica for shimmer
• PLA for structured, breakdown-friendly objects (think: nails, jewelry, packaging inserts)

PLA — polylactic acid — is fermented from plant sugars and breaks down in industrial composting in a few months. It's not a perfect substitute everywhere, but for any product that *needs* to be solid and structured but doesn't need to be permanent, PLA is the obvious answer.

The bottom line

You probably already have microplastics in your body. The realistic goal isn't to undo that — it's to stop adding to it. Audit your routine for the worst offenders (long-wear foundation, glitter, shine sprays, drugstore press-ons), and swap them one at a time for plant-based or mineral-based alternatives.