Kelp - or other types of seaweed - are sometimes recommended as a source of iodine, however kelp also contains varying amounts of bromine, so its iodine bromine ratio will ultimately determine whether it will have a beneficial or adverse effect on someone's thyroid. Some people develop an acne-like skin condition as a result of consuming iodine-containing foods, with the culprit being frequently bromine, but rarely iodine... Full Text