Calcium supplements should be separated from iodine/thyroid-related supplements for best absorption.
Calcium can interfere with the absorption of thyroid hormones and possibly iodine supplements when taken simultaneously.
Take calcium at least 4 hours apart from thyroid medications or iodine supplements.
Known drug category interactions for these supplements. Especially relevant if you take prescription medications.
Calcium reduces levothyroxine absorption, potentially causing thyroid levels to fluctuate.
Take levothyroxine at least 4 hours before or after calcium supplements.
Reference values for safe daily intake of these supplements.
Excess may increase kidney stone risk and potentially cardiovascular risk.
Excess can cause thyroid dysfunction.