Laminaria longissima extract

Laminaria longissima extract 1
AKA: Longissima Kelp Extract, Long-leafed Kelp Extract
Plant-Derived
Humectant
Marine
Extract
Not Clean
Laminaria Longissima Extract is the extract of the alga, Laminaria longissima
Family
Laminariaceae (Brown Algae)
Plant Part
Thallus
CAS #
-
Form
Liquid
Functions
Humectant
A moisture magnet. Pulls water from the air and deeper skin layers up to the surface to keep skin plump and hydrated.
Locks In Moisture
Traditional Use
Laminaria longissima is a brown kelp used in traditional Japanese and Korean skincare for centuries, valued for its mineral content and believed moisturizing properties. Seaweed-based skincare preparations were documented in East Asian beauty practices for treating dryness and improving skin texture.
EWG
4
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
Dryness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR