Lugol’s Iodine – The Trusted, Original Formula. A safe and highly effective iodine solution, Lugol’s Iodine is renowned for its purity and potency. Iodine is present in every organ of the human body and is essential for overall health. Despite its importance, many of us have insufficient iodine levels—a deficiency linked to a wide range of health concerns. Originally developed in 1829 by French physician Jean Lugol, this classic formula combines 5% elemental iodine with 10% potassium iodide. It has stood the test of time—and for good reason.