Used as a disinfectant for wound treatment, surface sterilization, and skin preparation before surgery or injections due to its ability to kill bacteria, viruses, and fungi. Commonly found in antiseptic solutions like tincture of iodine or povidone-iodine for medical use.

Essential in thyroid function as a key component of thyroid hormones (T3 and T4), making it critical in dietary supplements and iodized salt to prevent iodine deficiency disorders such as goiter, particularly in children and pregnant women.

Employed in laboratory settings as a reagent for titration, especially in iodometric titrations to determine concentrations of oxidizing and reducing agents. Also used as a solvent or catalyst in chemical synthesis and analytical processes.

Utilized in the pharmaceutical industry for synthesizing contrast agents used in medical imaging, such as in CT scans and X-rays.

Applied in water purification systems to disinfect drinking water, particularly in emergency or outdoor settings.

Used in organic chemistry as a catalyst or reagent in various reactions, including iodination processes and the preparation of iodinated compounds.

In the food industry, used as a starch indicator; reaction with starch produces a deep blue color, aiding in contamination detection or food composition analysis.

Found in some dyes and pigments, and historically used in photography for toning and developing images.