Imidazolidinyl Urea

AKA: IMIDUREA, 39236-46-9, Germall 115, Methanebis(N, N'-(5-ureido-2, 4-diketotetrahydroimidazole)-N, N-dimethylol), N''-Methylenebis(N'-(1-(hydroxymethyl)-2, 5-dioxo-4-imidazolidinyl)urea), CHEBI:51805
Allergen Warning
⚠️ Formaldehyde Releaser
Synthetic
Preservative
Not Clean
N,N'-Methylenebis[N'-[3-(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl]urea]
Formula
C11H16N8O8
Mol. Weight
388.29
CAS #
39236-46-9
Form
Powder
State
Exists as the monohydrate: White odorless solid; [Merck Index]
Functions
Preservative
Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.
Anti-Inflammatory
Moisturizing
Boosts Collagen
Prevents microbial growth
Traditional Use
Developed in the 1950s as a formaldehyde-releasing preservative to replace natural preservation methods. It was one of the first synthetic antimicrobial compounds widely adopted by the cosmetics industry.
EWG
4
CIR
Reviewed by CIR
Pregnancy
Caution
CIR Safety Findings
Not a Sensitizer
all-shades-safe
Concentration Guide
0.6%
0%1%
Reg. Limit
EU regulatory limit: 0.6%. Source: EU Cosmetics Regulation (EC) 1223/2009, Annex V (Preservatives), Entry 27.
Regulatory Status
USAunder review
EUpermitted
JAPANpermitted
CANADApermitted
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
The paper trail
🔬Peer-reviewed1 paper
⚖️Regulatory1 listing
🛡️Safety-assessed2 reviews
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR