Some supplements contain potassium iodide, while others use iodine from kelp or other natural sources. The form of iodine is also essential, as supplements can come in liquid, capsule, or tablet form.

The review highlighted that dietary sources of iodine, such as iodized salt and animal products, are becoming less common due to changing dietary habits, including a shift towards plant-based diets.

A lack of natural iodine in the soil and water ... Dairy, meat and white fish are key sources of iodine, but decreasing demand, alongside the growing popularity of dairy milk substitutes like ...