What it is
Cladosiphon Okamuranus Extract is derived from a brown alga cultivated in the waters around Okinawa, Japan, and is notable for its high content of fucoidan, a sulfated polysaccharide. In cosmetic formulas it is used to help bind water at the skin surface and to leave a smooth, conditioned feel. It is most often found in soothing or moisturizing leave-on products, including sunscreens marketed for sensitive skin.
Safety & warnings
Seaweed extracts of this type are generally well tolerated in cosmetic use. As with other marine botanicals, individuals with known allergies to seaweed or iodine-rich materials may wish to use caution. It is not an oil and is not considered comedogenic.
Origin & sourcing
Naturally derived from the brown seaweed Cladosiphon okamuranus, which is farmed in coastal Okinawa and processed by aqueous extraction.
Questions everyone asks
What is mozuku in this ingredient?
Mozuku is an edible brown seaweed traditionally harvested in Okinawa, Japan. The cosmetic extract is valued for its content of fucoidan, a water-binding polysaccharide.
What does it do in a sunscreen?
It acts as a humectant and skin-conditioning agent, helping the formula feel smooth and hydrated rather than contributing to UV protection itself.