Can You Take Calcium with Thyroid Medication?
Medically reviewed by Faith Coleman, University of New Mexico School of Medicine on August 23rd, 2026.
Calcium should not be taken simultaneously with thyroid medication as it significantly reduces absorption. Calcium binds to thyroid hormones like levothyroxine in the digestive tract, preventing proper absorption and potentially reducing medication effectiveness by up to 40%. The FDA recommends at least 4 hours between taking calcium supplements and thyroid medication. This separation ensures optimal absorption of both substances. Many patients successfully manage this timing by taking thyroid medication first thing in the morning on an empty stomach, then taking calcium supplements with lunch or dinner. Always consult your healthcare provider about proper timing for your specific medications and supplements.
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