Marine algae are chlorophyll-containing organisms, ranging from simple single cell formations to more complex multi-cell forms, such as seaweed. Seaweed is a natural thickening agent commonly found in cosmetics. It is also used for its water binding and antioxidant attributes. Blue-green algae may cause skin irritation. See Carrageenan, Fucus Vesiculosis, Palmaria Palmata and, Seaweed Extract.

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