Imidazolidinyl Urea
Also known as: Germall 115, imidurea, N,N'-methylenebis(N'-(1-(hydroxymethyl)-2,5-dioxo-4-imidazolidinyl)urea)
A formaldehyde-releasing antimicrobial preservative used in cosmetics, pharmaceuticals, and personal care products. While less aggressive than quaternium-15, it still releases formaldehyde — a known human carcinogen — over time as it preserves the product.
1 = low concern, 10 = avoid
Risk by Usage Frequency
How risk changes depending on how often you use products containing Imidazolidinyl Urea.
Low-level formaldehyde exposure even from occasional use. Sensitized individuals should avoid entirely.
Daily use creates chronic low-level formaldehyde exposure. Avoid in leave-on products especially.
Significant carcinogen and allergen risk from cumulative formaldehyde exposure across products.
Health Risks
Releases formaldehyde, a known human carcinogen (IARC Group 1), slowly over the shelf life of the product.
IARC Monographs Volume 100F — Formaldehyde
Common contact allergen; ranked among the top cosmetic sensitizers in patch testing studies.
North American Contact Dermatitis Group — standard allergen series results
Can cause dermatitis, redness, and irritation, particularly in individuals already sensitized to formaldehyde.
Global Regulatory Status
How imidazolidinyl urea is regulated in cosmetics and personal care products around the world.
80% of countries with data ban or restrict this ingredient
Details
Max 0.6% as preservative (Annex V); must label 'contains formaldehyde' if >0.05%.
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Max 0.6% with labeling requirements.
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Restricted as formaldehyde releaser on Hotlist.
Details
Permitted under MHLW positive list with limits.
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Permitted with limits and formaldehyde labeling.
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Max 0.6% per Safety Technical Standards.
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Max 0.6% per ANVISA.
Details
Max 0.6%, aligned with EU.
Why Brands Use Imidazolidinyl Urea
Effective antimicrobial preservative active against bacteria. Often used in combination with parabens or other preservatives for broader-spectrum protection.
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Better alternatives exist. Brands choose imidazolidinyl urea because it's cheap and effective, but safer options like potassium sorbate, sodium benzoate, ethylhexylglycerin deliver similar results without the health concerns.
Imidazolidinyl Urea in Product Categories
Click a category to see every product containing imidazolidinyl urea in that category, with full ingredient breakdowns.
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Safe Alternatives
What Numbrrrz Uses Instead
Numbrrrz is formaldehyde-free — always. Our lip balms are preserved naturally by vitamin E, and our simple formula does not require synthetic antimicrobial preservation.
