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Ingredient deep-dive

DMDM Hydantoin: Is It a Microplastic?

Medium concernPlasticiser / chemical of concern

Formaldehyde-releasing preservative. Not a plastic. Works by slowly releasing small amounts of formaldehyde, a known human carcinogen by inhalation, which is why it draws scrutiny in leave-on products.

Where it appears

  • Shampoo and conditioner
  • Lotions
  • Liquid soap

Regulatory status (2026)

European Union

Permitted with limits and mandatory "releases formaldehyde" labelling above threshold.

United States

No federal restriction.

Cleaner alternatives

  • Phenoxyethanol-preserved formulas
  • Sodium benzoate and potassium sorbate
  • Airless packaging

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DMDM Hydantoin, common questions

Is DMDM Hydantoin a microplastic?

Yes: it is classified as a synthetic polymer. Formaldehyde-releasing preservative. Not a plastic. Works by slowly releasing small amounts of formaldehyde, a known human carcinogen by inhalation, which is why it draws scrutiny in leave-on products.

Is DMDM Hydantoin banned?

EU: Permitted with limits and mandatory "releases formaldehyde" labelling above threshold. US: No federal restriction.

What can I use instead of DMDM Hydantoin?

Cleaner alternatives include: Phenoxyethanol-preserved formulas; Sodium benzoate and potassium sorbate; Airless packaging.

What products contain DMDM Hydantoin?

Commonly found in: Shampoo and conditioner; Lotions; Liquid soap.

Related ingredients

Parabens

Plasticiser / chemical of concern · Medium concern

Preservatives flagged for endocrine activity; commonly co-occur with plastic polymers in synthetic formulas.

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Phthalates

Plasticiser / chemical of concern · High concern

Plasticisers used to soften plastic, banned from many products. Strong endocrine disruptors.

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BHT / BHA

Plasticiser / chemical of concern · Low concern

Synthetic antioxidants, co-occurrence flag in plastic-heavy formulas.

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DEHP (Diethylhexyl Phthalate)

Plasticiser / chemical of concern · High concern

The most studied plasticiser and a recognised endocrine disruptor. Banned in EU cosmetics. It reaches food and bodies mainly through plastic packaging and processing equipment rather than through cosmetic formulas.

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