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Macrocystis pyrifera (Kelp) protein
AKA “Kelp Protein”
Ingredient
Ingredient Facts
Macrocystis pyrifera (Kelp) protein
AKA: Kelp Protein
Ingredient · Skin Conditioning · EWG: 3
Synthetic
Skin Conditioner
Marine
Not Clean
Macrocystis Pyrifera (Kelp) Protein is a cosmetic ingredient used as skin conditioning. Rated moderate hazard by EWG. Assessed as safe by the CIR.
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.
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
Pregnancy & Breastfeeding Safe
Yes
EWG
3
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Moderate Irritant
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Alaria esculenta (sea kelp) extract
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Ascophyllum nodosum (kelp) powder
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Ascophyllum nodosum [Kelp] Extract
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Macrocystis Pyrifera (Kelp)
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Macrocystis Pyrifera (Kelp) Blade/Pneumatocyst/Stipe Juice Extract
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Macrocystis Pyrifera (Kelp) Extract
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Macrocystis Pyrifera (Kelp) Juice
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Macrocystis Pyrifera (Kelp) Protein
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 Jun 2026
Data: CosIng · EWG · CIR