Himanthalia elongata extract
AKA “Alga”
Extract
Ingredient Facts
Himanthalia elongata extract
AKA: Alga
Extract · Antioxidant · EWG: 4
Plant-Derived
Antioxidant
Humectant
Soothing
Skin Conditioner
Extract
Clean
A nutrient-rich seaweed extract from the Atlantic coast that strengthens and protects skin's natural barrier, keeping it resilient and healthy.
Family
Himanthaliaceae
Plant Part
Thallus
CAS #
223751-70-0
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.
Antioxidant
Fights free radicals — the unstable molecules from UV, pollution, and stress that break down collagen and cause premature aging.
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 brown seaweed traditionally used in Celtic coastal regions for food and medicine. Modern skincare use builds on historical kelp and seaweed applications for mineral content and skin conditioning.
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