Microplastics in Beauty and Lip Products: A Beauty Regulatory Blind Spot

HIGHR was founded on a simple fact.  The fact that everything on your lip is ingested.  This includes the learning that there are microplastics hiding in your favorite beauty and lip products.

It’s an uncomfortable truth baked into the beauty industry: every swipe of lipstick, glob of gloss, or balm re-swipe comes with incidental ingestion. Studies have long estimated that consumers ingest measurable amounts of lip product over time.

Yet the safety framework governing what goes into those formulas was never designed with ingestion in mind. That disconnect is why HIGHR exists as a company.

The Regulatory Gap No One Is Talking About

Cosmetic safety regulations - particularly in the U.S. - are largely built on dermal exposure models. In simple terms, ingredients are considered safe if they do not penetrate the skin barrier in meaningful amounts.

This logic is applied broadly to plastic-derived ingredients like:

  • ~ Polyethylene
  • ~ Polybutene
  • ~ Hydrogenated polyisobutene
  • ~ Polyisobutene
  • ~ Acrylates copolymers

These materials are widely used in cosmetics because they are:

  • ~ Film-forming
  • ~ Texture-enhancing
  • ~ Stabilizing
  • ~ Long-wear boosting

And crucially, they are considered non-penetrating on intact skin.

But here’s the problem: lip products are not just applied topically - they are orally ingested.

There is no parallel regulatory framework that evaluates these ingredients for chronic, low-dose ingestion through lip products. The assumption of safety breaks down completely in this context.


What’s Actually in Lip Products: A Closer Look

The biggest makeup brands formulate many of their lip products with a combination of waxes, emollients, and synthetic polymers designed for performance and wear. A review of commonly listed INCI ingredients across their lipsticks and glosses reveals repeated use of plastic-derived compounds.

Here’s a breakdown of key plasticizers and polymers:

1. Polyethylene

  • ~ Function: Bulking agent, viscosity control, texture enhancer
  • ~ What it is: A solid microplastic polymer
  • ~ Concerns:
    • Classified as a microplastic in environmental contexts
    • Not biodegradable
    • While considered inert on skin, ingestion raises concerns about accumulation and long-term exposure

2. Polybutene

  • ~ Function: Gloss enhancer, binder, adhesive (helps product stick to lips)
  • ~ What it is: A synthetic liquid polymer derived from petroleum
  • ~ Concerns:
    • Persistent hydrocarbon compound
    • Limited data on chronic ingestion
    • Structurally similar to other petroleum-derived polymers under scrutiny

3. Hydrogenated Polyisobutene

  • ~ Function: Emollient, shine enhancer, texture smoother
  • ~ What it is: A hydrogenated synthetic polymer often used as a mineral oil alternative
  • ~ Concerns:
    • Highly refined, but still petroleum-derived
    • Considered safe dermally; ingestion safety data is minimal in cosmetic context

4. Polyisobutene

  • ~ Function: Film former, viscosity agent
  • ~ What it is: Synthetic rubber-like polymer
  • ~ Concerns:
    • Persistent and non-biodegradable
    • Designed to create long-wear films—raising questions about ingestion of film residues

5. Acrylates Copolymer

  • ~ Function: Film-forming agent for long-wear and transfer resistance
  • ~ What it is: A class of synthetic plastic polymers
  • ~ Concerns:
    • Often cited in microplastic discussions
    • Can degrade into smaller plastic particles over time
    • No ingestion-specific safety framework

Key takeaway: These ingredients are not unusual—they are industry standard. But they were approved under a skin exposure model, not an ingestion model.


Clean Labels: Better, But Not Plastic-Free

Clean label designations are often interpreted by consumers as a signal of comprehensive safety. In reality, it is a curated exclusion list, not a full toxicological standard.

What Clean Labels Usually Ban:

  • ~ Certain parabens
  • ~ Phthalates
  • ~ Formaldehyde donors
  • ~ Some petrochemicals
  • ~ Oxybenzone and octinoxate

What They Do Not Fully Address:

  • ~ Oral ingestion risks
  • ~ All synthetic polymers
  • ~ All microplastic-related ingredients

Plastic-Derived or Borderline Ingredients Still Permitted:

Even within “clean” lip products, you may still find:

  • ~ Hydrogenated polyisobutene (allowed as a “safer” emollient alternative)
  • ~ Synthetic waxes (often polymer-based)
  • ~ Certain acrylates (depending on formulation and classification)

Additionally, “clean” standards often operate on:

  • ~ Threshold-based allowances (trace levels permitted)
  • ~ Category-based exclusions (not all polymers are categorized as problematic)

This creates a grey area where products can be marketed as clean while still containing plastic-derived ingredients, especially those considered inert on skin.

Dermal vs. Oral Exposure: Why This Distinction Matters

The science used to justify plastic-derived ingredients in cosmetics hinges on one key premise:

If it doesn’t penetrate the skin, it’s safe.

But ingestion changes everything.

Dermal Exposure:

  • ~ Skin acts as a barrier
  • ~ Large polymer molecules typically cannot penetrate
  • ~ Risk assessment focuses on irritation and absorption

Oral Exposure (Lip Products):

  • ~ Ingredients are directly ingested
  • ~ Bypass the skin barrier entirely
  • ~ Enter the digestive system
  • ~ Potential for:
    • Bioaccumulation
    • Interaction with gut microbiome
    • Breakdown into smaller particles or additives

And yet, there is no dedicated regulatory category for “ingested cosmetics.”

Lip products exist in a regulatory grey zone - treated like skincare, but used like food-adjacent products.

The Bigger Picture: A System Built on the Wrong Assumption

The widespread use of synthetic polymers in lip products isn’t the result of negligence - it’s the result of outdated regulatory assumptions.

  • ~ Safety = non-penetration through skin
  • ~ Lip products = treated as topical
  • ~ Ingestion = largely ignored

As a result, consumers are unknowingly ingesting plastic-derived ingredients daily, without a clear understanding of long-term implications.

What Needs to Change

This isn’t about panic—it’s about precision.

We need:

  • ~ Category-specific safety standards for lip products
  • ~ Toxicological studies focused on chronic ingestion of cosmetic polymers
  • ~ Clear labeling of plastic-derived ingredients
  • ~ Stronger definitions of “clean” that include ingestion risk

A Call to Action

Consumers deserve transparency about what they’re putting on, and into, their bodies.

The next time you reach for a lip product, ask:

  • ~ Is this ingredient safe to ingest repeatedly?
  • ~ Was it tested for this use case?
  • ~ Or was it simply approved for skin?

Because when it comes to lip products, “topically safe” is no longer a sufficient standard.


microplastics in beauty products

0 comments

Leave a comment