Can You Take Calcium and Iodine Together?

Dose or timing may matter

The short answer

High calcium intake may interfere with iodine uptake by the thyroid gland. Calcium can affect the sodium-iodide symporter (NIS) function, potentially reducing thyroid hormone synthesis.

How to arrange timing

Separate calcium and iodine supplementation by several hours, especially if thyroid function is a concern.

Reference

Reference noted for this combination: Zimmermann MB, Köhrle J. The impact of iron and selenium deficiencies on iodine and thyroid metabolism. Thyroid. 2002;12(10):867-878

Important context

Whether supplements suit you together also depends on dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.