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Vegetable Glycerin
Many liquid iodine supplements use USDA Certified Organic vegetable glycerine as a neutral inert liquid medium to hold inorganic forms of iodine. 'Pesticide-free' "Organic" means something entirely different than 'organic molecules'.
Only because they use Certified Organic vegetable glycerin, they are allowed to use the USDA Certified Organic logo on the label - and many iodine consumers incorrectly believe they are taking an organic iodine supplement.