First aid antiseptic. Does not expire, it always stays fresh. As a water purifier add 6 drops per liter of water. No need to refrigerate, but keep out of direct sunlight. Iodine is necessary for the thyroid gland's proper performance of its work. We usually get iodine from our diet, however the soil is depleted of essential nutrients and iodine is one of those minerals. In Japan the average consumption of iodine is 10-14mg daily. Important information Must not be used during pregnancy, while taking medications, for thyroid disorders or allergies. Do not take if you are allergic to iodine. Only recommended for external use. Always seek the advice of a qualified physician or pharmacist. Instructions for use: for external use or as directed by the physician. Made of 2% Iodine & 4% Potassium iodide and bi-demineralized water