Potassium Iodide

Iodine is needed to make thyroid hormones, which set the pace of the body’s metabolism. Most ordinary ingredients contain little of it, so foods add a small, measured amount through potassium iodide, calcium iodate or similar compounds.

Both too little and too much can upset the thyroid, so nutrient profiles set a range. Kelp and other seaweeds add iodine as well, in amounts that vary. Cats with an overactive thyroid may be on a diet with limited iodine, set by a veterinarian.