Natures Aid Sea Kelp tablets are a fantastic source of Iodine, providing 450ug of Iodine per daily dose. This is equivalent to 300 percent NRV. Iodine is an important mineral element which has many beneficial effects, including the maintenance of normal skin; and the maintenance of normal thyroid function. Natures Aid Sea Kelp is sourced from the North Atlantic Ocean. Available in 180 tablets.