Porphyra umbilicalis (red algae/laver) extract is a marine-derived ingredient rich in polysaccharides, amino acids (including mycosporine-like amino acids), vitamins, and minerals, used in skincare for antioxidant, hydrating, and photoprotective-supporting effects. It is valued for soothing and moisture-retention properties in cosmetic formulations.
| Reported effect | How often | Notes |
|---|---|---|
Contact irritation or mild redness | Rare | Generally well tolerated; transient irritation possible in sensitive skin. |
Allergic contact dermatitis | Very rare | Isolated sensitivity reactions to marine algae extracts have been reported. |
Iodine-related concerns | Very rare | Seaweed-derived ingredients naturally contain iodine; topical relevance is minimal but noted for those with iodine sensitivity. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.