What it is
Fucus Vesiculosus Extract is derived from bladderwrack, a brown algae rich in polysaccharides and minerals. In skincare and sunscreens it functions as a moisturizing, skin-conditioning marine ingredient and does not act as a UV filter. It is commonly used at low concentrations for its film-forming and hydrating character.
Safety & warnings
Generally well tolerated topically. Because seaweed extracts naturally contain iodine, this is occasionally noted as a consideration, though topical cosmetic exposure is low; the overall formula's preservative and fragrance system has more bearing on tolerability.
Origin & sourcing
Natural; obtained from the brown seaweed Fucus vesiculosus harvested from coastal waters, usually as a water or glycol extract.
Questions everyone asks
Is bladderwrack a UV filter?
No. It is a marine conditioning and humectant botanical and provides no measurable sun protection.
What does seaweed extract do for skin?
Its polysaccharides help condition and hydrate the skin and can contribute to a smooth feel in the formula.