If you want to feel energized and well so you can live your best life, healthy thyroid function is key! That's why Solaray offers our powerful Kelp 550 mg supplement. With a high nutritional value, kelp is especially known for its concentration of naturally occurring iodine. Proper iodine levels are essential to good health because your thyroid's primary function is to take iodine and convert it into thyroid hormones that play a major role in metabolism, growth, and development as well as regulating many body functions.