Buy directly from the manufacturer and save! We have the best prices on the internet! Equivalent to USP or Higher 16 oz Bottle "1/2 Strength" Equal to more than 6 oz. of Lugol's Solution 5% (in solution). Free dropper bottle included with each 16 oz. bottle. FREE SHIPPING! (US) Calculating Number of MG's of Iodine and Iodide per Drop of LUGOL'S 2%: Each VERTICAL "metric" drop (= 1/20 ml) is approximately 1.0 mg of iodine and 2.0 mg of potassium iodide. The Iodide portion of Potassium Iodide is about 75% so that is 1.5 mg. Therefore the total Iodine plus Iodide is 1.0 + 1.5 = 2.5 mg and 2 drops is about 5.0 mg's of iodine/iodide (2.0 mg iodine, 3.0 mg iodide). Compared to iodine and potassium iodide tablets, J.CROW'S Lugol's Solution offers big savings. Approximately 9600 vertical drops per 16 oz. container. To use as a water purifier add 3-6 drops per liter of water. Made from premium ingredients, the iodine used in J.CROW'S Lugol's Solution is derived from mined crystals from 320 million year old natural brine deposits two miles beneath the earth's surface in Western USA (one of the few places in the world where such deposits exist). Not made from shellfish. The water used is distilled, pure, New Hampshire spring water. Always fresh. Does not expire. Store at room temperature out of direct sunlight. No need to refrigerate. Be safe. Accept no substitutes. Keep J.CROW'S Lugol's Solution of Iodine on hand. #1 Best Seller. Trusted Worldwide. Low Heavy Metal Verified. USA Sourced.