Gelidium cartilagineum extract
AKA “Alga”
Extract
Ingredient Facts
Gelidium cartilagineum extract
AKA: Alga
Extract · Soothing · EWG: 4
Plant-Derived
Humectant
Soothing
Skin Conditioner
Extract
Clean
Red algae from the Atlantic Ocean and Mediterranean that helps protect and shield skin, keeping it healthy and resilient.
Family
Gelidiaceae
Plant Part
Whole Plant
CAS #
94945-01-4
Form
Liquid
See origin →
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Humectant
A moisture magnet. Pulls water from the air and deeper skin layers up to the surface to keep skin plump and hydrated.
Soothing
Calms redness, irritation, and inflammation. Your skin's chill pill — great for sensitive, reactive, or post-procedure skin.
Nourishes & Protects
Traditional Use
A red seaweed with historical use in traditional European and Asian coastal skincare, valued for its mucilaginous and hydrating properties that were traditionally applied to soothe and condition the skin.
Skin Types
●all-skin-types
Best For
Dullness
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
Final Report: Safety Assessment of Brown Algae-Derived Ingredients as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Final Report: Safety Assessment of Red Algae-Derived Ingredients as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Algae Peptides
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
RALGA (Diacneal), a retinaldehyde and glycolic acid assoc...
A D Katsambas
Dermatology (Basel, Switzerland), 2005
Verified Feb 2026
Data: CosIng · EWG · CIR