Isobutylparaben

AKA: Isobutyl 4-hydroxybenzoate, 4247-02-3, Isobutyl paraben, Isobutyl p-hydroxybenzoate, Isobutyl-4-hydroxybenzoate, Isobutyl parahydroxybenzoate, Benzoic acid, 2-methylpropyl ester, Isobutyl-p-hydroxybenzoate
Synthetic
Preservative
Not Clean
The CIR Expert Panel concluded that the following 20 parabens are safe in cosmetics in the present practices of use and concentration described in the safety assessment when the sum of the combined concentration of parabens in any given formulation does not exceed 0.8 %...Isobutylparaben
Formula
C11H14O3
Mol. Weight
194.23
CAS #
4247-02-3
Form
Powder
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
Functions
Antimicrobial
Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.
Fights Bacteria
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed3 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
10
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
Skin Irritant in Testing
1 study / 1 irritating / reactions weak (CIR 746)
Sensitizer in Testing
1 study / 1 sensitizing (CIR 746)
Concentration Guide
Leave-on0.00000006–0.3%
Rinse-off0.0000004–0.23%
0%50%100%
CIR reported use · 2016 survey
Regulatory Status
USA✔ permitted
EU✔ permitted
JAPAN✔ permitted
CANADA✔ permitted
🧂Conflict of interest.
Verified Jun 2026 · 🧪 = conflict
Data: PubChem · CosIng · EWG · CIR