Sargassum thunbergii extract

AKA: Thunberg's Seaweed Extract

Plant-Derived

Preservative

Extract

Not Clean

Sargassum Thunbergii Extract is the extract of the alga, Sargassum thunbergii, Sargassaceae.

Family

Sargassaceae

Plant Part

Thallus

Form

Liquid

Functions

Antimicrobial

Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.

Fights Bacteria

Traditional Use

A brown seaweed with a long history of use in Traditional Chinese Medicine and Japanese herbalism. Traditionally used as a nutritive and therapeutic ingredient.

EWG

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

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Skin Types

●all-skin-types

Best For

Dullness

Pregnancy & Breastfeeding Safe

Yes

The paper trail

🔬Peer-reviewed1 paper →

⚖️Regulatory0 listings

🛡️Safety-assessed1 review →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

Verified Jun 2026

Data: CosIng · EWG · CIR