The Thyroid is one of the largest endocrine glands in the body, controlling how quickly the body burns energy, makes proteins, and how sensitive the body should be to other hormones. The thyroid produces thyroid hormones, principally thyroxine (T4) and triiodothyronine (T3). These hormones regulate the rate of metabolism, body temperature and protein, fat and carbohydrate utilisation. Iodine is an essential component of both these thyroid hormones and Kelp is a natural source of Iodine Kelp ( Fucus vesiculosus), also known by the common name Bladder wrack, is a seaweed found on the coasts of the North Sea, Western Baltic Sea, and the Atlantic and Pacific Oceans. It was the original source of iodine, discovered in 1811, and was used extensively for its benefits to thyroid health.