Warner Marine Research Concentrated Iodide Supplement is the premier Iodide product available today. It is produced entirely from Pharmaceutical Grade (U.S.P.) Potassium Iodide, the highest quality raw material in the hobby. Warner Marine Research is the only manufacturer to use these fine quality raw materials. It is also highly concentrated, making it highly cost effective compared to lower quality competing products. Most importantly Warner Marine Research Concentrated Iodide is highly effective at adding high quality bio-available Iodide without the unneccesary impurities found in the competitors products.