Contains a single wild brown seaweed called Ascophyllum nodosum, Seagreens Iodine+ Capsules are the finest source of stable, chelated iodine in nature and, because this supplement is a whole food, it contains variety of other nutrients. Many of these, like selenium, are essential for the body to make proper use of the iodine and so is of special value to vegans and vegetarians. 100% additive free in a vegetable capsule.