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Find Iodine here at SpectrumChemical.com. It comes in many different forms and grades, including Iodine ACS Reagent, Crystal USP, USP Volumetric Solution, and more. Spectrum Chemical has exactly the form and grade of Iodine for your lab needs. Iodine, a chemical element, is primarily used in nutrition and in the production of certain polymers and acetic acid. Because of its low toxicity, high atomic number, and easy attachment to organic compounds, iodine has been used as part of X-ray contrast materials. It is found concentrated in brine pools and oceans and is considered the heaviest essential element used by life in biological functions.