Always fresh Does not expirenApproximately 1200 vertical drops per 2 oz containernTo use as a water purifier add 3-6 drops per liter of waternKeep out of direct sunlight. No need to refrigeratenThe iodine used in JCROWu0026#39;S Lugolu0026#39;s Solution is derived from mined crystals, not from shellfish or kelpnCalculating Number of MGu0026#39;s of Iodine and Potassium Iodide per Drop of Lugolu0026#39;s Solution: LUGOLu0026#39;S 2%: Each VERTICAL drop is about 2.5 mgu0026#39;s of iodine/potassium iodide (1 mg iodine, 1.5 mg potassium iodide) and 2 drops is about 5 mgu0026#39;s of iodine/potassium iodide (2 mg iodine, 3 mg potassium iodide)nLugol's Solution 2 Percent features a concentrated dose of iodine, which isn't produced naturally within the body. Iodine helps regulate thyroid function by balancing thyroid hormones.