How do supplements effect thyroid medications

Q: How do supplements effect thyroid medications, such as Synthroid, armour thyroid, or Cytomel? What supplements do I need to avoid?

A: If you are taking any of the following supplements, take them at least 2-3 hours apart from your thyroid medication: Calcium supplements, calcium-fortified orange juice, or Iron supplements. Be very careful about taking iodine or kelp careful about supplements if you are on thyroid hormone replacement therapy.