Kelp is a good source of the essential mineral iodine which is important in maintaining healthy thyroid function. Nature's Life® Icelandic Kelp is harvested in late autumn and winter from the mineral-rich ocean waters around Iceland in the Northern Atlantic Ocean. After harvesting, the kelp is carefully washed, chopped, dried, ground and screened. The washing is done with mineral-rich fresh water from geothermal bores and the heat for the drying process is obtained from the same source. This process ensures maximum retention of the minerals, vitamins, amino acids and essential fatty acids. NO chemicals, pesticides or herbicides are used in growing or processing.