Macrocystis pyrifera (Kelp)
AKA: Giant Kelp
Synthetic
Marine
Not Clean
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
Functions
Viscosity Controlling
Controls Viscosity
Antioxidant Protection
Reduces Inflammation
Locks In Moisture
Traditional Use
Used for centuries in traditional Asian medicine, particularly in China and Japan, as a nutrient-rich food and topical remedy for skin health and joint conditions. Applied in traditional skincare practices for its mineral and iodine content.
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