Iodine is a valuable trace element whose health-promoting effects are being rediscovered today. This mineral is fundamentally involved in the production of thyroid hormones. The gastrointestinal tract, prostate, ovaries, and even the brain also require iodine. This guide explains what our body needs iodine for and provides information on individual requirements. It highlights the conditions that iodine can help with, such as hypothyroidism, Hashimoto's disease, or breast cancer, and discusses the therapeutic approaches that can generally counteract iodine deficiency. The measures include an iodine protocol for high-dose iodine therapy.