murphySilk Powder
molecular structure · PubChem
AKA: Silk Fibroin Powder, Powdered Silk
Synthetic
Skin Conditioner
Clean
Origin-Derived (silkworm)
Serica Powder (EU)
CAS #
9009-99-8
Form
Powder
State
Solid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Bulking
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Locks in moisture
The paper trail
🔬Peer-reviewednone on file
⚖️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 Phototoxic
Animal test found no phototoxicity in the CIR safety assessment (CIR 699)
Not a Skin Irritant
3 studies / 3 not irritating (CIR 699)
Not a Sensitizer
3 studies / 3 not sensitizing (CIR 699)
Mixed Eye Irritation Results
2 studies / 1 irritating / 1 not irritating / reactions slight (CIR 699)
Concentration Guide
Leave-on0.0001–1.4%
Rinse-off0.0001–0.1%
0%50%100%
CIR reported use · 2014 survey
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR