Mineral Oil vs Formaldehyde (free): which is worse?
Quick answer: Formaldehyde (free) carries the heavier risk profile. Mineral Oil is — in the EU and — in the US; Formaldehyde (free) is banned in the EU and allowed in the US.
| Property | Mineral Oil | Formaldehyde (free) |
|---|---|---|
| EU status | — | Banned |
| US status | — | Allowed |
| Risk level | — | high |
| Banned in | — | European Union |
| Restricted in | European Union (E905 restricted to specific applications; extensive ongoing EFSA evaluation of MOSH/MOAH contamination), Australia (restricted levels) | — |
| Category | additive | cmr |
| Where it hides | — | nail hardener, keratin treatment, eyelash glue |
What is Mineral Oil?
Mineral oil (E905) is a refined petroleum product used as a food-grade lubricant, coating agent, and glazing agent in food processing and production. Food-grade mineral oil is a highly refined grade of petroleum distillate with specifications limiting impurities. It differs from pharmaceutical-grade (Vaseline) and cosmetic-grade mineral oils in refinement level.
What is Formaldehyde (free)?
Formaldehyde (free) is free formaldehyde used directly as a preservative and in salon hair treatments.
Documented risks
Mineral Oil: EFSA has raised significant concerns about mineral oil hydrocarbons (MOH) contamination in food through two pathways: (1) deliberate food-grade mineral oil use in coatings and processing, and (2) migration from recycled paper and cardboard food packaging into food. MOH comprises two types: mineral oil saturated hydrocarbons (MOSH), which accumulate in human adipose tissue, liver, and spleen, and mineral oil aromatic hydrocarbons (MOAH), which include polycyclic aromatic hydrocarbons (PAHs) that are potentially carcinogenic. A 2011 Swiss study found mineral oil hydrocarbons in human liver and spleen samples from autopsy, demonstrating real bioaccumulation. EFSA's 2023 preliminary opinion identified MOAH contamination in food as a safety concern that cannot be dismissed, recommending ALARA (as low as reasonably achievable) minimization. Untreated and mildly treated mineral oils are IARC Group 1 human carcinogens for occupational inhalation. Highly refined food-grade mineral oil (E905) is not classified as a direct carcinogen, but MOAH contamination in even food-grade mineral oil is an ongoing concern.
Formaldehyde (free): A known human carcinogen (IARC Group 1). Banned from direct use in EU cosmetics; allowed in US products with limited oversight.
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