Macrocystis pyrifera (Kelp)

Macrocystis pyrifera (Kelp) 1
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Macrocystis pyrifera (Kelp) 2
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Macrocystis pyrifera (Kelp) 3
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Macrocystis pyrifera (Kelp) 4
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Macrocystis pyrifera (Kelp) 5
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Macrocystis pyrifera (Kelp) 6
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AKA: Giant Kelp
Synthetic
Marine
Not Clean
OriginMacrocystis pyrifera is a brown kelp species harvested from cold ocean waters off coastal regions worldwide. The kelp is processed through aqueous extraction and purification to isolate polysaccharides used as thickening agents.
Macrocystis Pyrifera (Kelp) is a cosmetic ingredient used as viscosity controlling. Rated moderate hazard by EWG. Assessed as safe by the CIR.
CAS #
347174-92-9
Form
Powder
Skin Types
●all-skin-types
Best For
Dullness
Pregnancy & Breastfeeding Safe
Yes
Functions
Viscosity Controlling
Controls Viscosity
Antioxidant Protection
Reduces Inflammation
Locks In Moisture
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.
EWG
3
CIR
Safe as used
Pregnancy
Yes
Concentration Guide
CIR's newest survey reports no concentration of use.
CIR · report published 2026
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR