Macrocystis pyrifera (Kelp) protein

Macrocystis pyrifera (Kelp) protein 1
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AKA: Giant Kelp, Kelp Protein
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
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.
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
Skin Types
●all-skin-types
Best For
Dullness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR