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In page Kelp:

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Alginate, a kelp-derived carbohydrate, is used to thicken products such as ice cream, jelly, salad dressing, and toothpaste, as well as an ingredient in exotic dog food and in manufactured goods.[7][8][9] Alginate powder is also used frequently in general dentistry and orthodontics for making impressions of the upper and lower arches.[10] Kelp polysaccharides are used in skin care as gelling ingredients and because of the benefits provided by fucoidan.[citation needed]