Kelp has been shown to promote thyroid function and improve a sluggish metabolism, particularly because kelp is rich in iodine. In fact, seaweeds like kelp are among nature’s richest sources of iodine. The synthesis and secretion of thyroid hormones depend on sufficient levels of iodine, along with the amino acid tyrosine. The thyroid hormone thyroxine (T4) consists of approximately 65% iodine, while triiodothyronine (T3) contains up to 59% iodine. Since iodine is not stored in the body, it must be obtained daily from the diet in order to maintain healthy thyroid function. An iodine deficiency is associated with hypothyroidism (low thyroid function), as well as mental retardation and cretinism (stunted physical and mental development in children). Kelp is also a plentiful source of calcium, potassium and some B-vitamins.1-3,19,22-24