Macrocystis pyrifera (Kelp) protein
AKA “Kelp”
Synthetic
Ingredient Facts
Macrocystis pyrifera (Kelp) protein
Synthetic · Humectant · EWG: 3
Synthetic
Humectant
Occlusive
Skin Conditioner
Marine
Synthetic
Clean
Science: Functions: SKIN CONDITIONING Safety Ratings: CIR: Safe as used
CAS #
347174-92-9
Form
Powder
State
Solid
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.
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Conditions Skin
Antioxidant Protection
Reduces Inflammation
Locks In Moisture
Softens & Smooths
Traditional Use
An isolated protein fraction from kelp developed in modern times to harness the amino acid and protein content traditionally valued in Asian skincare for skin conditioning and fortification.
Skin Types
●all-skin-types
Best For
Dullness
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
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European Commission
EU Cosmetic Ingredient Database (CosIng)
Macrocystis Pyrifera (Kelp)
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Macrocystis Pyrifera (Kelp) Protein
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Physicochemical characterization and cosmetic application of kelp blanching water polysaccharides.
Liu P, Hu J, Wang Q, Tan J, Wei J et al.
International journal of biological macromolecules, 2023
Verified Feb 2026
Data: CosIng · EWG · CIR