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Ingredient deep-dive

Dimethiconol: Is It a Microplastic?

Low concernSilicone

Hydroxyl-terminated silicone used for shine and slip, especially in hair care. A siloxane, so outside the microplastic definition, though it is a persistent synthetic polymer.

Where it appears

  • Hair serums and shine sprays
  • Conditioners
  • Frizz control
  • Leave-in treatments

Regulatory status (2026)

European Union

Permitted; not among the restricted cyclic siloxanes.

United States

No federal restriction.

Cleaner alternatives

  • Argan oil
  • Squalane
  • Broccoli seed oil

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Dimethiconol, common questions

Is Dimethiconol a microplastic?

Borderline. Hydroxyl-terminated silicone used for shine and slip, especially in hair care. A siloxane, so outside the microplastic definition, though it is a persistent synthetic polymer.

Is Dimethiconol banned?

EU: Permitted; not among the restricted cyclic siloxanes. US: No federal restriction.

What can I use instead of Dimethiconol?

Cleaner alternatives include: Argan oil; Squalane; Broccoli seed oil.

What products contain Dimethiconol?

Commonly found in: Hair serums and shine sprays; Conditioners; Frizz control; Leave-in treatments.

Related ingredients

Dimethicone

Silicone · Medium concern

Silicone polymer (polydimethylsiloxane). Not the same as solid microplastic but classed as a synthetic polymer; EU is consulting on tighter limits.

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Cyclomethicone / Cyclopentasiloxane

Silicone · Medium concern

Cyclic siloxanes. D4 and D5 variants are EU-restricted in rinse-off products.

Read more

Trimethicone / Phenyl Trimethicone

Silicone · Low concern

Silicone polymer variant used for slip and shine.

Read more

Polysilicone-X

Silicone · Medium concern

Synthetic silicone polymer family used as film-formers in long-wear makeup.

Read more