Calcium Alginate
AKA: Alginic acid calcium salt
Synthetic
Marine
Clean
Alginic acid, calcium salt
CAS #
9005-35-0
Form
Powder
Functions
Viscosity Controlling
Anti-Inflammatory
Wound Healing
Antimicrobial
Provides scent
Controls product thickness
Traditional Use
Derived from brown seaweed (kelp), alginates have been used for centuries in Asian cuisines and traditional medicine. Modern extraction and use in cosmetics as a thickening, film-forming, and moisturizing agent began in the 20th century.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
ewg-1
medical-approval
pregnancy-nursing-safe
all-shades-safe
Concentration Guide
Dermal absorption: 2%. Source: CIR Safety Assessment (CIR Seq 680).
Regulatory Agencies
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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.
Verified Jun 2026
Data: CosIng · EWG · CIR