Dmdm Hydantoin

DMDM Hydantoin is a formaldehyde-donor preservative found in a variety of cosmetic and personal care products. It limits microbial growth in formulas, though it raises irritation concerns and faces restrictions in some regions.
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Ingredient Snapshot

Overview
A preservative that can release formaldehyde and may irritate skin.
Category
Preservative
Type
Preservative

Ingredient Ratings

Overall Rating

Poor

Comedogenic Risk

None

Skin Benefits

Helps protect products from microbial contamination, extending usable life. Some individuals may experience sensitivity, so it may not suit all users.

Uses In Skincare & Cosmetics

Frequently used in rinse-off formats like shampoos, conditioners, and body washes. Also appears in gels and lotions, though many brands opt for alternative systems in leave-on products.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

Carries a notable risk of irritation and allergic contact dermatitis, particularly for sensitive skin or with prolonged leave-on exposure. In the EU and some regions it is restricted by concentration limits and requires “contains formaldehyde” labeling above a free-formaldehyde threshold. Users prone to sensitivity may prefer to avoid it, especially in leave-on products.

Is Dmdm Hydantoin a Good Ingredient?

Poor: While it is an effective preservative, it releases small amounts of formaldehyde, which increases the risk of irritation and sensitization; several regions place limits or labeling requirements, lowering its suitability compared with alternatives.

Products with Dmdm Hydantoin

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