Norwegian kelp is a brown seaweed harvested from the Atlantic coastline of eastern North America, Greenland, Norway, Britain and Ireland. Like other varieties of kelp, Norwegian kelp is a rich source of natural iodine. It also contains at least 14 vitamins and 18 minerals, including folate, niacin, vitamin K, calcium, zinc, potassium and manganese. Aside from the nutritional boost, kelp is also added to bath water and to foot soaks to help ease muscle aches, stiff joints and minor skin irritations.