We are a good source but peruse the FAQ. Clarks is sodium based not potassium. the original is potassium Iodide and Iodine in distilled water.
Due to DEA rule changes in 2007 sales of products containing 5% (iodine)are restricted but sales of products containing 2% (iodine)are not .
If you are using 2% or "half strength" simply double or go 2.5 x's or 3 x"s your use level to get an equivalent to the 4.5-5.5% traditional Lugol's range for Iodine and potassium Iodide ratios.