murphyPotassium Butylparaben
AKA: 38566-94-8, POTASSIUM SALT, P-HYDROXYBENZOATE POTASSIUM SALT, BENZOIC ACID, BUTYL ESTER, POTASSIUM SALT (1:1)
Synthetic
Preservative
Not Clean
OriginPotassium butylparaben is synthesized from p-hydroxybenzoic acid, a benzoic acid derivative from the paraben chemical family. It is produced through esterification of p-hydroxybenzoic acid with butanol, followed by potassium salt formation.
Potassium butyl 4-oxidobenzoate
Formula
C11H13KO3
Mol. Weight
232.32
CAS #
38566-94-8
Form
Powder
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
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.
Preserves Formula
Prevents microbial growth
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed0 reviews
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
Caution
Restricted By
Concentration Guide
Reported use0.062%
0%50%100%
Reg. limit 0.14%
EU regulatory limit: 0.14% (as acid) for the sum of the individual concentrations; 0.8% (as acid) for mixtures of substances in entries 12 and 12a, where the sum of butylparaben and propylparaben and their salts does not exceed 0.14%. Leave-on products for children under three years of age: do not use on the nappy area. Source: EU Cosmetics Regulation (EC) 1223/2009, Annex V (Preservatives), Entry 12a.
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR