Sodium/TEA-Undecylenoyl Carrageenan
AKA “Undecylenoyl Carrageenan, Red Algae Extract”
Synthetic
Ingredient Facts
Sodium/tea-undecylenoyl carrageenan
AKA: Red Algae Extract
Synthetic · Emulsion Stabilising · EWG: 4
Plant-Derived
Emulsifier
Skin Conditioner
Hair Care
Marine
Synthetic
Clean
A natural conditioning ingredient derived from seaweed that helps keep the formula stable while softening and moisturizing both skin and hair.
CAS #
224580-91-0
See origin →
Functions
Emulsion Stabilising
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
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
Traditional Use
A modern complex derived from undecylenic acid and carrageenan (a red seaweed extract traditionally used in skincare). Created to combine antifungal properties with the soothing and thickening benefits of seaweed polysaccharides.
Skin Types
●all-skin-types
Best For
Acne
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
Dermal absorption: 2%. Source: CIR Safety Assessment (CIR Seq 680).
Regulatory Agencies
UV Photoprotection, Cytotoxicity and Immunology Capacity of Red Algae Extracts.
Álvarez-Gómez F, Korbee N, Casas-Arrojo V, Abdala-Díaz RT, Figueroa FL
Molecules (Basel, Switzerland), 2019
Potassium Undecylenoyl Carrageenan
European Commission
EU Cosmetic Ingredient Database (CosIng)
Sodium/TEA-Undecylenoyl Carrageenan
European Commission
EU Cosmetic Ingredient Database (CosIng)
Verified Feb 2026
Data: CosIng · EWG · CIR