murphyPolyisoprene
AKA: Natural rubber, Cis-polyisoprene, Rubber
Synthetic
Clean
OriginDerived from isoprene monomers, a hydrocarbon compound synthesized from petroleum or renewable feedstocks. Produced through polymerization via catalytic processes such as Ziegler-Natta or metallocene catalysis.
Homopolymer of 2-methyl-1,3-butadiene
CAS #
9003-31-0
Form
Powder
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Viscosity Controlling
Controls Viscosity
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.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
1 study / 1 not sensitizing (CIR 687)
Concentration Guide
Leave-on0.098–47%
Rinse-off1.8%
0%50%100%
CIR reported use · report published 2020
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR