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Quick answer: Tris(hydroxymethyl)nitromethane carries the heavier risk profile. Sodium Cocoyl Isethionate is allowed in the EU and allowed in the US; Tris(hydroxymethyl)nitromethane is banned in the EU and allowed in the US.
| Property | Sodium Cocoyl Isethionate | Tris(hydroxymethyl)nitromethane |
|---|---|---|
| EU status | Allowed | Banned |
| US status | Allowed | Allowed |
| Risk level | low | high |
| Banned in | — | European Union |
| Restricted in | — | — |
| Category | surfactant | formaldehyde releaser |
| Where it hides | Dove Sensitive Skin Beauty Bar, Sebamed Clear Face Cleansing Bar, Paula's Choice Calm Redness Relief Cleanser | liquid soap, shampoo |
Sodium cocoyl isethionate is a mild anionic surfactant derived from coconut fatty acids and isethionic acid. It exists as a solid powder and produces a creamy, conditioning lather that leaves skin feeling soft. It is the primary surfactant in most syndet (synthetic detergent) bars.
Tris(hydroxymethyl)nitromethane is a preservative that slowly releases formaldehyde to kill bacteria in water-based personal-care products.
Sodium Cocoyl Isethionate: Sodium cocoyl isethionate has an excellent safety record. It is one of the surfactants recommended by the National Eczema Association for sensitive and atopic skin. No carcinogenic, mutagenic, or endocrine-disrupting effects are known. Potential contact sensitization is extremely rare. It performs well at physiological pH, minimizing skin barrier disruption.
Tris(hydroxymethyl)nitromethane: Formaldehyde is a known human carcinogen and a common skin sensitizer. The EU restricts formaldehyde-releasing preservatives and requires warning labels; Washington State is phasing them out, while they remain unrestricted federally in the US.
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