Iodine is a natural water purifier. The Lugol's iodine was developed by Joseph Lugol's in 1824. Lugol's iodine is excellent for use as a vegetable and fruit wash. Since the body requires the element of iodine for essential body functions, use of Lugol's iodine as a vegetable wash and water purifier has been recommended for decades. Our Lugol's iodine is made weekly and we use only mined crystals. If the taste of iodine as a water purifier is bitter, it is recommended you add a vitamin c to improve the taste. We use mined crystals to make our Lugol's iodine.