Kelp, native to oceans and seas, has many benefits including thyroid health. The main reason for this is the fact that it's rich in iodine. Not only is it rich in iodine, but it's filled vitamins and minerals including "46 minerals, 16 amino acids, and 11 vitamins. Kelp helps the body stay hydrated, keeps thyroid levels normal, weight loss (due to higher metabolism), improves body ph, and even helps to protect from radiation. Kelp comes in many forms of supplements such as tablets, pills, raw form (kelp), capsules, and even extract form. 

One of the things iodine, also kelp, is known for is heavy-metal detoxification. The way it works is because of iodine's heavy atomic weight. Even heavy metals such as fluoride, lead, arsenic, etc. have a lighter atomic weight than iodine. What happens is that iodine replaces these harmful atoms, and they flush out from your body, leaving behind the healthy iodine. Iodine also helps heal cuts dramatically by its anti-germ properties. Although, the FDA's supposed claim states that the daily limit of iodine should be no more than 225 micrograms of iodine, studies have shown that people do much better on iodine levels up to 50 milligrams per day.