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The term kelp includes any of a variety of large brown seaweeds that are found in cold waters throughout the world. In many countries it's harvested and used as a food, or dried and sold as powder.
It contains an abundance of minerals and trace elements, but is mainly valued for being one of the richest sources of iodine - fresh kelp containing about 100,000 mcg iodine per pound, while dried kelp contains nearly ten times as much.
Through its high iodine content it can reduce some forms of cancer.
People with an over active thyroid should consult their doctor before taking extra kelp. See 'Alternative Medicine'; 'Iodine'