Always fresh Does not expire;Approximately 1200 vertical drops per 2 oz container;To use as a water purifier add 3-6 drops per liter of water;Keep out of direct sunlight. No need to refrigerate;The iodine used in JCROW'S Lugol's Solution is derived from mined crystals, not from shellfish or kelp;Calculating Number of MG's of Iodine and Potassium Iodide per Drop of Lugol's Solution: LUGOL'S 2%: Each VERTICAL drop is about 2.5 mg's of iodine/potassium iodide (1 mg iodine, 1.5 mg potassium iodide) and 2 drops is about 5 mg's of iodine/potassium iodide (2 mg iodine, 3 mg potassium iodide)