Alginic Acid

Alginic Acid 1
AKA: Sodium alginate, Alginate
Synthetic
Skin Conditioner
Marine
Acid
Clean
Alginic acid
CAS #
9005-32-7
Form
Liquid
State
Solid
Functions
Binding
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Viscosity Controlling
Locks in moisture
Traditional Use
Extracted from brown algae, this compound has been used in traditional Asian skincare and cosmetics for centuries as part of seaweed-based treatments. Modern isolation and use in cosmetics began in the 20th century as a thickening and film-forming agent.
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 Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
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.
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Verified Jun 2026
Data: CosIng · EWG · CIR