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Methylpropanediol

Well toleratedHumectanthumectantsolventpenetration enhancer

No meaningful concern for most people; irritation is possible but rare.

Also written as: 2-Methyl-1,3-Propanediol · MPDiol

What it is

Methylpropanediol is a small synthetic diol used to hydrate, dissolve difficult ingredients and thin out formulas. It is valued for a notably light, quick-absorbing skin feel and for helping other water-soluble actives spread evenly.

What it does well

  • Hydrates without heaviness and improves the delivery of other ingredients

    It gives a light, non-tacky feel and can improve how well water-soluble actives spread and penetrate. It also boosts the performance of some preservative systems.

    Moderate evidence

Worth knowing

  • Enhances penetration of everything else in the formula

    This is usually a benefit, but it means any irritating ingredient in the same product may be felt a little more strongly. Reported irritation from methylpropanediol itself is low.

    Matters most toPeople using strong actives who are prone to stinging.

Where the EU stands

No specific restriction

Permitted in EU cosmetics with no concentration limit. It is not listed in the banned, restricted or preservative annexes of the Cosmetics Regulation.

Masks that contain Methylpropanediol