Cited skincare — every flag names its source, no upsell.
Un

Undaria Pinnatifida Extract

Undaria Pinnatifida ExtractBarrier

Wakame seaweed extract whose fucoidan polysaccharide supports epidermal barrier repair by promoting keratinocyte differentiation.

What it does

Wakame seaweed extract contains fucoidan, a plant sugar with skin-conditioning properties. In animal models, fucoidan repaired barrier damage by prompting skin cells to mature and build the outer skin layer. Cell studies identified a receptor that fucoidan activates to trigger this maturation process. The evidence is from lab and animal models; human clinical trials are not yet available.

The evidence, graded

emergingWakame fucoidan repaired a disrupted skin barrier in an animal model. In skin cell studies, it activated a receptor that triggers skin cell maturation, which is how the barrier is built. Multiple signalling pathways were involved, supporting a multi-target mechanism for barrier repair.Chen 2019 · Mar Drugs ↗

Graded per the methodology: strong · moderate · emerging · expert consensus. A weak source on a strong claim gets the weaker label.

Also known as

wakame extract, wakame seaweed extract

Pairs worth knowing

Ceramides · works together ↗Hyaluronic Acid · works together ↗Niacinamide (Vitamin B3) · works together ↗Panthenol (Pro-vitamin B5) · works together ↗

Browse all 668 ingredients — grouped by what they do, each with whatever evidence we can cite.

This page is public so a shared ingredient card always has its sources behind it — and so you can check them without an account.
Want more like this?
Every evidence-based flag cites its source, Drop tells you when your routine is complete, and it helps you simplify — instead of selling you more. The app launches on iOS and Android in October 2026. Rate my routine works today at /rate — no sign-in.
See what Drop doesHow Drop works