Isobutylparaben
AKA “Isobutyl 4-hydroxybenzoate, isobutyl paraben, Isobutyl p-hydroxybenzoate, Isobutyl-4-hydroxybenzoate, Isobutyl parahydroxybenzoate, Benzoic acid, 2-methylpropyl ester, isobutyl-p-hydroxybenzoate”
Synthetic
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Ingredient Facts
Isobutylparaben
AKA: Isobutyl 4-hydroxybenzoate, Isobutyl paraben, Isobutyl p-hydroxybenzoate, Isobutyl-4-hydroxybenzoate, Isobutyl parahydroxybenzoate, Benzoic acid, 2-methylpropyl ester, Isobutyl-p-hydroxybenzoate
Synthetic · Antimicrobial · EWG: 4
Synthetic
Preservative
Synthetic
Not Clean
Helps preserve the product and keep it fresh by preventing the growth of bacteria and mold.
Formula
C11H14O3
Mol. Weight
194.23
CAS #
4247-02-3
Form
Powder
Synthetic
Synthetic
Function
Antimicrobial
Benefits
Fights Bacteria
Traditional Use
Synthetic preservative developed in the mid-20th century as part of the paraben family. Created to prevent microbial contamination in cosmetic products with improved stability compared to earlier natural preservatives.
Skin Types
all-skin-types
Best For
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Caution
Restricted By
EWG Score4
CIR Safety Findings
medical-approval, all-shades-safe, Phototoxicity Concern
Concentration Guide
Industry Max
Industry typically uses up to 0.062% in leave-on products (2 products reported). Dermal absorption: 0.1%. Source: CIR Safety Assessment (CIR Seq 746).
Regulatory Agencies
Safety Assessment of Benzyl Alcohol, Benzoic Acid and its...
Wilbur Johnson, Wilma F Bergfeld, Donald V Belsito, Ronald A Hill, Curtis D Klaassen, Daniel C Liebler + 5 more
International journal of toxicology, 2017
Safety Assessment of Benzyl Alcohol, Benzoic Acid and its...
Wilbur Johnson, Wilma F Bergfeld, Donald V Belsito, Ronald A Hill, Curtis D Klaassen, Daniel C Liebler + 5 more
International journal of toxicology, 2017
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR