Microplastics in Cosmetics: What Testing Labs Are Actually Finding — and What US Brands Need to Do Now

The EU didn’t wait. In October 2023, European Commission Regulation 2023/2055 restricted intentionally added microplastics across hundreds of product categories — including rinse-off and leave-on cosmetics. That regulation is now actively enforced, with phase-out periods running through 2035 depending on the product type. Meanwhile, the FDA has issued no equivalent rule, and a lot of US cosmetic brands are treating microplastics as someone else’s problem.

That assumption is becoming expensive to hold.

The US Regulatory Picture Is More Complicated Than “No Rule Yet”

Americans tend to frame microplastics regulation as a European story. And it partly is — the EU’s restriction under Regulation 2023/2055 is the most comprehensive anywhere in the world. But US brands are already operating under overlapping pressures that make proactive testing the sensible move, not just a future compliance box.

The Microbead-Free Waters Act of 2015 was the opening move domestically. It banned intentionally added plastic microbeads — solid plastic particles less than 5mm in diameter — from rinse-off cosmetics and personal care products. That law is enforced by FDA under 21 CFR, and violations carry real consequences. What it doesn’t reach is the broader universe of microplastic contamination: particles that enter formulations through raw material carry-in, packaging migration, or manufacturing environments rather than intentional formulation decisions.

California isn’t waiting for federal action either. State-level attention on plastic particle exposure has accelerated through legislation like SB 54 (Plastic Pollution Prevention and Packaging Producer Responsibility Act) and related rulemaking. Regulatory attorneys we work with regularly flag microplastics as a near-term rulemaking risk at the California state level — which typically means the rest of the country follows within a few years.

And then there’s the market reality, which is moving faster than any regulator. Retailers — Amazon included — are expanding restricted substance lists for cosmetics. Several major EU retail chains now require microplastic-free declarations from cosmetic suppliers before onboarding. A US brand selling through European distributors or on EU-based marketplaces already needs documentation, regardless of what Washington has or hasn’t mandated.

What “Microplastics Testing” Actually Means in a Cosmetic Testing Lab

This is where most brands’ understanding falls apart. Microplastics aren’t tested with a single method the way lead is measured by ICP-MS. The analytical approach depends on what polymer types you’re looking for, the physical form of the particles, the complexity of the cosmetic matrix, and the detection limit you need. Cosmetic testing labs that do this well draw from three main methodologies.

Micro-FTIR (Fourier Transform Infrared Spectroscopy) is currently the most widely used technique for microplastic identification in cosmetic products. It identifies polymer types by matching infrared absorption spectra against validated reference libraries — distinguishing polyethylene from polypropylene from nylon, for example. Micro-FTIR can detect particles down to approximately 10–20 µm, and it’s well-suited for mapping particle distribution across a sample. The data output is polymer-specific and interpretable in a regulatory context, which matters when you’re building a Technical File for EU compliance.

Raman Spectroscopy operates on similar identification principles but offers better spatial resolution. Detection thresholds can reach 1 µm in well-configured instruments, which becomes important as regulatory attention shifts toward nanoplastics. The practical tradeoff is that Raman is more susceptible to fluorescence interference in pigmented cosmetics — most makeup products — so skilled analysts spend significant time on background correction. In a heavily pigmented matrix, Raman results need to be interpreted cautiously.

Pyrolysis-GC/MS takes a destructive approach: the sample is thermally degraded and the polymer breakdown products are analyzed by gas chromatography and mass spectrometry. It’s highly sensitive and doesn’t require physical separation of particles first, making it particularly useful for complex emulsions, thick creams, or oil-based formulations where particle isolation is difficult. The tradeoff is that you lose morphological information — you know polyethylene is present, but not the particle count, size distribution, or shape.

For most US cosmetic brands running a preliminary characterization, we start with micro-FTIR because it’s broadly applicable and the results are directly defensible in regulatory documentation. Pyrolysis-GC/MS gets layered in when the matrix complexity makes particle isolation unreliable, or when a brand needs quantitative polymer mass fraction data for an EU submission.

One point brands consistently underestimate: sample preparation takes longer than the analysis itself. Cosmetic matrices — emulsions, oils, pigmented formulas — require careful enzymatic or chemical digestion to break down organic matter before microplastic particles can be isolated and characterized. A rushed or undocumented prep step produces false negatives, and we’ve seen brand submissions to EU distributors rejected not because they failed testing, but because the cosmetic testing laboratory they used didn’t document their sample preparation methodology adequately. Method validation records and prep SOPs matter.

How Microplastic Contamination Actually Enters Cosmetic Formulas

Testing finds measurable microplastic particles in roughly 60–70% of cosmetic formulations when brands submit for the first time without having audited their supply chain. Not all of those findings trace back to intentionally added ingredients. The sources break into three main pathways.

Raw material carry-in is the largest contributor. Synthetic polymers — acrylates, carbomers, polyethylene glycol derivatives — are standard cosmetic ingredients, and certain grades carry trace plastic particle contamination from their own manufacturing processes. The problem is that many supplier COAs don’t address particle contamination at all, because this wasn’t a measurement category historically. Requesting particle characterization data from polymer-based ingredient suppliers is becoming part of responsible supplier qualification, and ISO 17025 accredited cosmetic testing labs can run per-ingredient screening to fill in the gaps where supplier data is absent.

Packaging migration is consistently underappreciated. Plastic containers, pumps, and tubes shed particles at measurable rates — especially when the formula is slightly acidic (as many serums, AHA products, and vitamin C formulations are) or contains solvents that interact with the polymer matrix. A product stored in a thin-walled plastic bottle for 18 months accumulates a meaningfully higher particle load than freshly filled product. ISO 8317 and ASTM D7388 provide migration testing frameworks, though neither was designed specifically to quantify microplastic particle release. Dedicated migration testing for cosmetic packaging is a developing area, and forward-thinking brands are establishing baselines now.

Airborne contamination during manufacturing is the third pathway and the hardest to control retroactively. Facilities with inadequate HEPA filtration, or those co-manufacturing plastic-intensive products alongside cosmetics, show elevated background counts in finished goods. Environmental monitoring programs — similar in concept to what 21 CFR Part 111 requires for dietary supplement facilities — are increasingly relevant for cosmetic manufacturers concerned about microplastic background levels.

Understanding the contamination source matters because the remediation path is completely different. A raw material issue gets resolved through supplier qualification and ingredient grade selection. A packaging issue requires container change or barrier treatment. A facility-level issue requires an environmental monitoring overhaul. Brands that skip root cause analysis and just re-test hoping for a cleaner result typically spend more, not less, before they fix the problem.

Building a Defensible Testing Strategy Before You’re Forced To

Brands that waited on PFAS testing found themselves scrambling when state-level restrictions began dropping rapidly after 2021. Microplastics are tracking a nearly identical trajectory. The proactive approach, which costs far less than a reactive one, looks like this:

Run a baseline characterization on your top SKUs first. Submit your five highest-volume products to a cosmetic testing laboratory for micro-FTIR screening — full sample prep, polymer identification, semi-quantitative particle load assessment. The goal isn’t pass/fail at this stage; it’s knowing where you actually stand. Most brands are surprised by the baseline.

Audit your raw material COAs for polymer-based ingredients. Any ingredient described as a copolymer, acrylate, carbomer, or synthetic polymer of any kind should have particle contamination data. If it doesn’t, request it from your supplier or run independent screening. ISO 17025 accredited labs can do this per-ingredient as a standalone service.

Establish a packaging migration baseline. Pull finished product that’s been stored in its commercial packaging for at least 6 months and compare particle load against freshly filled product. The difference tells you exactly how much your packaging is contributing to total particle burden — and whether a container change would make a meaningful difference.

Build your documentation now, not when someone asks for it. If you sell into the EU or anticipate doing so, your Technical File under EU Regulation 1223/2009 is where this evidence needs to live. Under MoCRA (the Modernization of Cosmetics Regulation Act of 2022), FDA now has expanded authority over cosmetic safety substantiation in the US as well — and “emerging contaminant characterization” is exactly the kind of documentation that distinguishes brands with real safety programs from those with paper compliance.

For Amazon sellers specifically: third-party testing documentation for cosmetics is already required in categories with recent regulatory scrutiny. Getting microplastic characterization into your test package now means the data exists when policy shifts. Amazon’s Restricted Products Policy has expanded twice in the past 18 months, and the pattern is consistent — categories under regulatory pressure get added before sellers have time to react.

The brands we work with who handle this best share one characteristic: they treat their cosmetic testing laboratory as a partner in anticipating regulatory trends, not just a pass/fail service. The data from a thorough baseline screen informs formulation decisions, supplier negotiations, and packaging choices — all of which take time to execute. Starting that process in 2026, ahead of the regulatory pressure wave, is the advantage.

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Written by Nour Abochama, Vice President of Operations, Qalitex Laboratories. Learn more about our team

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Related from our network

• MoCRA Compliance and FDA Cosmetics Documentation Strategy — Aurora TIC covers the regulatory consulting side of building a defensible US cosmetics safety file under expanded FDA authority.
• Cosmetic Raw Material Testing and Supplier COA Verification — Ayah Labs works with formulators on ingredient-level characterization, including polymer-grade materials that may carry microplastic contamination.
• Cosmetic Product Testing for Canadian Market Entry — Androxa supports brands expanding into Canada, where Health Canada’s cosmetic notification and safety substantiation requirements are evolving in parallel with US MoCRA.