FREE SHIPPING (USA and Canada) We ship internationally. Calculating Number of MG's of Iodine and Potassium Iodide per Drop of Lugol's Solution: LUGOL'S 5%: Each VERTICAL drop is about 6.25 mg's of iodinepotassium iodide (2.5 mg iodine, 3.75 mg potassium iodide) and 2 drops is about 12.50 mg's of iodinepotassium iodide (5.0 mg iodine, 7.50 mg potassium iodide). Compared to other's, J.CROW'S Lugol's Solution offers big savings. LUGOL'S 2%: Slightly less than 12 half the above measurements. Approximately 600 vertical drops per 1 oz. container. To use as a water purifier add 2-3 drops per liter of water. The iodine used in J.CROW'S Lugol's Solution is derived from mined crystals, not from shellfish or kelp. Always fresh. Does not expire. Store at room temperature. Keep out of direct sunlight. No need to refrigerate.