As a supplement, Thyroid Activator® may only be a few decades old, but the ingredients in this formula go back hundreds or even thousands of years! Traditional Chinese Medicine has utilized kelp to disperse phlegm and support thyroid health. According to Oriental Materia Medica, kelp softens hardness, disperses accumulation, resolves phlegm and cleanses heat. Native to Tunisia, southern Italy and other Mediterranean regions, parsley is still used in cooking there. Centuries of folk use teach us that parsley was employed for swelling, detoxification, and urinary and kidney support. Also called Smilax, sarsaparilla was used by some Central and South American cultures for skin problems and cough. European settlers took its benefits home in the 15th century.